chore: regenerate README (#137)

This PR was generated using Autosynth. 🌈


<details><summary>Log from Synthtool</summary>

```
2021-04-09 18:39:17,746 synthtool [DEBUG] > Executing /root/.cache/synthtool/java-pubsublite-spark/.github/readme/synth.py.
On branch autosynth-readme
nothing to commit, working tree clean
2021-04-09 18:39:18,946 synthtool [DEBUG] > Wrote metadata to .github/readme/synth.metadata/synth.metadata.

```
</details>

Full log will be available here:
https://source.cloud.google.com/results/invocations/ad0b016b-42ba-4d50-8f27-55b916c23ff5/targets

- [ ] To automatically regenerate this PR, check this box. (May take up to 24 hours.)

.github/readme/synth.metadata/synth.metadata

@@ -4,14 +4,14 @@
       "git": {
         "name": ".",
         "remote": "https://github.com/googleapis/java-pubsublite-spark.git",
-        "sha": "98f5863245584bf517d4817610dcca0c3979a470"
+        "sha": "eddcb420a9dd6f41a1dd07a56bcb6ec16a444a56"
       }
     },
     {
       "git": {
         "name": "synthtool",
         "remote": "https://github.com/googleapis/synthtool.git",
-        "sha": "705743e66f5c0b24a95f7f30619c9d3ef747b317"
+        "sha": "1f5e6bc8dc8e3661ee550905fc070e55e1b6cea1"
       }
     }
   ]

README.md

@@ -8,9 +8,12 @@ Java idiomatic client for [Pub/Sub Lite Spark Connector][product-docs].
 - [Product Documentation][product-docs]
 - [Client Library Documentation][javadocs]
 
+
 > Note: This client is a work-in-progress, and may occasionally
 > make backwards-incompatible changes.
 
+
+
 ## Quickstart
 
 
@@ -175,8 +178,11 @@ has instructions for running the samples.
 | Sample                      | Source Code                       | Try it |
 | --------------------------- | --------------------------------- | ------ |
 | Admin Utils | [source code](https://github.com/googleapis/java-pubsublite-spark/blob/master/samples/snippets/src/main/java/pubsublite/spark/AdminUtils.java) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/java-pubsublite-spark&page=editor&open_in_editor=samples/snippets/src/main/java/pubsublite/spark/AdminUtils.java) |
+| Common Utils | [source code](https://github.com/googleapis/java-pubsublite-spark/blob/master/samples/snippets/src/main/java/pubsublite/spark/CommonUtils.java) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/java-pubsublite-spark&page=editor&open_in_editor=samples/snippets/src/main/java/pubsublite/spark/CommonUtils.java) |
 | Publish Words | [source code](https://github.com/googleapis/java-pubsublite-spark/blob/master/samples/snippets/src/main/java/pubsublite/spark/PublishWords.java) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/java-pubsublite-spark&page=editor&open_in_editor=samples/snippets/src/main/java/pubsublite/spark/PublishWords.java) |
 | Read Results | [source code](https://github.com/googleapis/java-pubsublite-spark/blob/master/samples/snippets/src/main/java/pubsublite/spark/ReadResults.java) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/java-pubsublite-spark&page=editor&open_in_editor=samples/snippets/src/main/java/pubsublite/spark/ReadResults.java) |
+| Simple Read | [source code](https://github.com/googleapis/java-pubsublite-spark/blob/master/samples/snippets/src/main/java/pubsublite/spark/SimpleRead.java) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/java-pubsublite-spark&page=editor&open_in_editor=samples/snippets/src/main/java/pubsublite/spark/SimpleRead.java) |
+| Simple Write | [source code](https://github.com/googleapis/java-pubsublite-spark/blob/master/samples/snippets/src/main/java/pubsublite/spark/SimpleWrite.java) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/java-pubsublite-spark&page=editor&open_in_editor=samples/snippets/src/main/java/pubsublite/spark/SimpleWrite.java) |
 | Word Count | [source code](https://github.com/googleapis/java-pubsublite-spark/blob/master/samples/snippets/src/main/java/pubsublite/spark/WordCount.java) | [![Open in Cloud Shell][shell_img]](https://console.cloud.google.com/cloudshell/open?git_repo=https://github.com/googleapis/java-pubsublite-spark&page=editor&open_in_editor=samples/snippets/src/main/java/pubsublite/spark/WordCount.java) |