Updated CI pipeline to automatically update application version, updated development workflow description in CONTRIBUTING.md

CONTRIBUTING.md

@@ -16,6 +16,7 @@ There are many ways in which you can contribute, beyond writing code. The goal o
   - [Contributing to codebase](#contributing-to-codebase)
     - [Build and run project](#build-and-run-project)
     - [Development workflow](#development-workflow)
+      - [Release](#release)
     - [Coding guidelines](#coding-guidelines)
       - [Indentation](#indentation)
       - [Names](#names)
@@ -101,7 +102,11 @@ This section represents how contributors should interact with codebase implement
 3. Making changes to codebase
 4. Updating [changelog.md](changelog.md)
 5. Creating a pull request to `master`
-6. Done!
+6. Validating PR with CI build
+7. Completing PR
+8. Done
+#### Release
+Next stage is release. Release performs on every push to master (which makes functional changes to application source code). Release performs via Azure Pipelines and triggers manually by pipeline owner ([@xfox111](https://github.com/xfox111)).
 
 ### Coding guidelines
 #### Indentation

azure-pipelines.yml

@@ -29,6 +29,15 @@ steps:
     failBuildLevelSelector: 'Error'
     failBuildOnCodeIssues: false
 
+- task: PowerShell@2
+  displayName: 'Update version number'
+  inputs:
+    targetType: 'inline'
+    script: |
+      (Get-Content AndroidManifest.xml -encoding UTF8 | Out-String) -replace '(?<=\bandroid:versionCode=")[^"]*', $(Build.BuildId) | set-content AndroidManifest.xml -encoding UTF8
+      (Get-Content AndroidManifest.xml -encoding UTF8 | Out-String) -replace '(?<=\bandroid:versionName=")[^"]*', $(Build.BuildNumber) | set-content AndroidManifest.xml -encoding UTF8
+    workingDirectory: '$(Build.SourcesDirectory)\GUT.Schedule\GUT.Schedule\Properties'
+
 - task: XamarinAndroid@1
   displayName: 'Build Solution (AppBundle)'
   inputs: