[#15] Add Contributing docs page

docs/input/docs/contributing/building.md

@@ -0,0 +1,51 @@
+---
+Order: 1
+---
+
+# Build scripts
+
+To build this package we are using Cake.
+
+On Windows PowerShell run:
+
+```powershell
+./build
+```
+
+On OSX/Linux run:
+
+```bash
+./build.sh
+```
+
+# Important developer tasks
+
+## Default task
+
+Clean, DotNetCore build, unit tests, code coverage, code analyze, NuGet package, create release notes.
+
+```powershell
+./build
+```
+```powershell
+./build -Target Default
+```
+
+## AppVeyor task
+
+The same as Default and:  
+Publish documentation, upload code coverage, publish release note, publish NuGet, upload build artifacts.
+
+```powershell
+./build -Target Appveyor
+```
+
+## Preview task
+
+```powershell
+./build -Target Preview
+```
+
+Generate documentation and host documentation locally for development.  
+More about [Preview](https://cake-contrib.github.io/Cake.Recipe/docs/usage/previewing-documentation) 
+and [Docs publishing](https://cake-contrib.github.io/Cake.Recipe/docs/usage/publishing-documentation)

docs/input/docs/contributing/integration-tests.md

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+---
+Order: 2
+---
+
+# Running integration tests
+
+Addin contains set of integration tests written as additional Cake files.  
+**test.cake** - is an entry point for integration tests. Installs Cake.MkDocs nuget package from BuildArtifacts directory and use him in all tests.  
+**setup.cake** - his responsibility is launch integration tests in sandbox.
+
+## Run-Integration-Tests task
+
+```powershell
+./build -Target Run-Integration-Tests
+```
+
+Task first of all execute *Default* target to build all artifacts.  
+After all use BuildArtifacts and runs integration tests (**test.cake**).
+
+## Run-Integration-Tests-Standalone task
+
+```powershell
+./build -Target Run-Integration-Tests-Standalone
+```
+
+Task use BuildArtifacts and runs integration tests without build - use for integration tests development.  
+This task is also run additionally after target task, when target is different than *Run-Integration-Tests* (e.g. *Default*, *Appveyor*) and BuildParameters.ShouldRunIntegrationTests flag is true.