feat: introduce billing budgets (#4122)

BillingBudgets/.gitattributes

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+/*.xml.dist export-ignore
+/tests export-ignore
+/.github export-ignore

BillingBudgets/.github/pull_request_template.md

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+**PLEASE READ THIS ENTIRE MESSAGE**
+
+Hello, and thank you for your contribution! Please note that this repository is
+a read-only split of `googleapis/google-cloud-php`. As such, we are
+unable to accept pull requests to this repository.
+
+We welcome your pull request and would be happy to consider it for inclusion in
+our library if you follow these steps:
+
+* Clone the parent client library repository:
+
+```sh
+$ git clone git@github.com:googleapis/google-cloud-php.git
+```
+
+* Move your changes into the correct location in that library. Library code
+belongs in `BillingBudgets/src`, and tests in `BillingBudgets/tests`.
+
+* Push the changes in a new branch to a fork, and open a new pull request
+[here](https://github.com/googleapis/google-cloud-php).
+
+Thanks again, and we look forward to seeing your proposed change!
+
+The Google Cloud PHP team

BillingBudgets/.repo-metadata.json

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+{
+    "distribution_name": "google/cloud-billing-budgets",
+    "release_level": "beta",
+    "client_documentation": "http://googleapis.github.io/google-cloud-php/#/docs/cloud-billing-budgets/latest"
+}

BillingBudgets/CODE_OF_CONDUCT.md

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+# Contributor Code of Conduct
+
+As contributors and maintainers of this project,
+and in the interest of fostering an open and welcoming community,
+we pledge to respect all people who contribute through reporting issues,
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+
+We are committed to making participation in this project
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+
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BillingBudgets/CONTRIBUTING.md

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+# How to Contribute
+
+We'd love to accept your patches and contributions to this project. We accept
+and review pull requests against the main
+[Google Cloud PHP](https://github.com/googleapis/google-cloud-php)
+repository, which contains all of our client libraries. You will also need to
+sign a Contributor License Agreement. For more details about how to contribute,
+see the
+[CONTRIBUTING.md](https://github.com/googleapis/google-cloud-php/blob/master/CONTRIBUTING.md)
+file in the main Google Cloud PHP repository.

BillingBudgets/LICENSE

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BillingBudgets/README.md

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+# Google Cloud Billing Budgets for PHP
+
+> Idiomatic PHP client for [Google Cloud Billing Budgets](https://cloud.google.com/billing).
+
+[![Latest Stable Version](https://poser.pugx.org/google/cloud-billing-budgets/v/stable)](https://packagist.org/packages/google/cloud-billing-budgets) [![Packagist](https://img.shields.io/packagist/dm/google/cloud-billing-budgets.svg)](https://packagist.org/packages/google/cloud-billing-budgets)
+
+* [API documentation](http://googleapis.github.io/google-cloud-php/#/docs/cloud-billing-budgets/latest/billingbudgets/readme)
+
+**NOTE:** This repository is part of [Google Cloud PHP](https://github.com/googleapis/google-cloud-php). Any
+support requests, bug reports, or development contributions should be directed to
+that project.
+
+### Installation
+
+To begin, install the preferred dependency manager for PHP, [Composer](https://getcomposer.org/).
+
+Now to install just this component:
+
+```sh
+$ composer require google/cloud-billing-budgets
+```
+
+Or to install the entire suite of components at once:
+
+```sh
+$ composer require google/cloud
+```
+
+This component supports both REST over HTTP/1.1 and gRPC. In order to take advantage of the benefits offered by gRPC (such as streaming methods)
+please see our [gRPC installation guide](https://cloud.google.com/php/grpc).
+
+### Authentication
+
+Please see our [Authentication guide](https://github.com/googleapis/google-cloud-php/blob/master/AUTHENTICATION.md) for more information
+on authenticating your client. Once authenticated, you'll be ready to start making requests.
+
+
+### Version
+
+This component is considered beta. As such, it should be expected to be mostly
+stable and we're working towards a release candidate. We will address issues
+and requests with a higher priority.
+
+### Next Steps
+
+1. Understand the [official documentation](https://cloud.google.com/billing/docs).

BillingBudgets/SECURITY.md

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+# Security Policy
+
+To report a security issue, please use [g.co/vulnz](https://g.co/vulnz).
+
+The Google Security Team will respond within 5 working days of your report on g.co/vulnz.
+
+We use g.co/vulnz for our intake, and do coordination and disclosure here using GitHub Security Advisory to privately discuss and fix the issue.

BillingBudgets/VERSION

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+0.0.0

BillingBudgets/composer.json

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+{
+    "name": "google/cloud-billing-budgets",
+    "description": "Google Cloud Billing Budgets Client for PHP",
+    "license": "Apache-2.0",
+    "minimum-stability": "stable",
+    "autoload": {
+        "psr-4": {
+            "Google\\Cloud\\Billing\\Budgets\\": "src",
+            "GPBMetadata\\Google\\Cloud\\Billing\\Budgets\\": "metadata"
+        }
+    },
+    "autoload-dev": {
+        "psr-4": {
+            "Google\\Cloud\\Billing\\Budgets\\Tests\\": "tests"
+        }
+    },
+    "extra": {
+        "component": {
+            "id": "cloud-billing-budgets",
+            "path": "BillingBudgets",
+            "entry": null,
+            "target": "googleapis/google-cloud-php-billing-budgets.git"
+        }
+    },
+    "require": {
+        "google/gax": "^1.7.0"
+    },
+    "require-dev": {
+        "phpunit/phpunit": "^4.8|^5.0",
+        "google/cloud-core": "^1.31",
+        "phpdocumentor/reflection": "^3.0"
+    },
+    "suggest": {
+        "ext-grpc": "Enables use of gRPC, a universal high-performance RPC framework created by Google.",
+        "ext-protobuf": "Provides a significant increase in throughput over the pure PHP protobuf implementation. See https://cloud.google.com/php/grpc for installation instructions."
+    }
+}