docs: add CLI help

docs/cmd/tk_get_sources_git.md

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+## tk get sources git
+
+Get git sources status
+
+### Synopsis
+
+
+The get sources command prints the status of the git resources.
+
+```
+tk get sources git [flags]
+```
+
+### Options
+
+```
+  -h, --help   help for git
+```
+
+### Options inherited from parent commands
+
+```
+      --components strings   list of components, accepts comma-separated values (default [source-controller,kustomize-controller])
+      --kubeconfig string    path to the kubeconfig file (default "~/.kube/config")
+      --namespace string     the namespace scope for this operation (default "gitops-system")
+      --timeout duration     timeout for this operation (default 5m0s)
+      --verbose              print generated objects
+```
+
+### SEE ALSO
+
+* [tk get sources](tk_get_sources.md)	 - Get sources commands
+
+###### Auto generated by spf13/cobra on 30-Apr-2020