docs(git-provider): Add initial git command documentation

- create solution folder for docs

PowershellModule.slnx

@@ -2,6 +2,9 @@
     <Folder Name="/build/">
         <Project Path="build/Build.csproj" />
     </Folder>
+    <Folder Name="/docs/">
+        <File Path="docs/GitRepositoryRegistration.md" />
+    </Folder>
     <Folder Name="/harnesses/">
         <Project Path="src/ModuleHarness/ModuleHarness.csproj" />
         <Project Path="src/PowershellHarness/PowershellHarness.csproj" />

docs/GitRepositoryRegistration.md

@@ -0,0 +1,19 @@
+# Git Repo Registration
+
+- all commands support `-debug`
+
+## New-GitRepoRegistration
+
+`New-GitRepoRegistration [-Name string]`
+
+## Get-GitRepoRegistration
+
+`Get-GitRepoRegistration`
+
+## Show-GitRepoRegistration
+
+`Show-GitRepoRegistration -Name string [-NoStack|-NoSetLocation]`
+
+## Remove-GitRepoRegistration
+
+`Remove-GitRepoRegistration [-Name string]`