Create integrations.md

docs/integrations.md

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+# Integrations
+Collection of advice how to auto check/format. Every sample expects dotnet format installed as local tool.
+
+## Pre-commit hook to reformat
+
+Create file `.git/pre-commit` with following contents:
+```sh
+#!/bin/sh
+LC_ALL=C
+# Select files to format
+FILES=$(git diff --cached --name-only --diff-filter=ACM "*.cs" | sed 's| |\\ |g')
+[ -z "$FILES" ] && exit 0
+
+# Format all selected files
+echo "$FILES" | cat | xargs | sed -e 's/ /,/g' | xargs dotnet format --include
+
+# Add back the modified files to staging
+echo "$FILES" | xargs git add
+
+exit 0
+
+```
+
+These instructions originally authored by [randulakoralage82](https://medium.com/@randulakoralage82/format-your-net-code-with-git-hooks-a0dc33f68048).
+
+
+## Check on PR in Azure Dev Ops
+
+Add following to your build file:
+
+```yaml
+- task: DotNetCoreCLI@2
+  displayName: 'Install dotnet tools'
+  inputs:
+    command: 'custom'
+    custom: 'tool'
+    arguments: 'restore'
+
+- task: DotNetCoreCLI@2
+  displayName: 'dotnet-format'
+  inputs:
+    command: 'custom'
+    custom: 'format'
+    arguments: '--check'
+```
+
+
+These instructions originally authored by [leotsarev](https://github.com/joinrpg/joinrpg-net/).