Add bootstrap docs

docs/cmd/tk_bootstrap_github.md

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+## tk bootstrap github
+
+Bootstrap GitHub repository
+
+### Synopsis
+
+
+The bootstrap command creates the GitHub repository if it doesn't exists and
+commits the toolkit components manifests to the master branch.
+Then it configure the target cluster to synchronize with the repository.
+If the toolkit components are present on the cluster,
+the bootstrap command will perform an upgrade if needed.
+
+```
+tk bootstrap github [flags]
+```
+
+### Examples
+
+```
+  # Create a GitHub personal access token and export it as an env var
+  export GITHUB_TOKEN=<my-token>
+
+  # Run bootstrap for a private repo owned by a GitHub organization
+  bootstrap github --owner=<organization> --repository=<repo name>
+
+  # Run bootstrap for a public repository on a personal account
+  bootstrap github --owner=<user> --repository=<repo name> --private=false --personal=true 
+
+  # Run bootstrap for a private repo hosted on GitHub Enterprise
+  bootstrap github --owner=<organization> --repository=<repo name> --hostname=<domain>
+
+```
+
+### Options
+
+```
+  -h, --help                help for github
+      --hostname string     GitHub hostname (default "github.com")
+      --interval duration   sync interval (default 1m0s)
+      --owner string        GitHub user or organization name
+      --personal            is personal repository
+      --private             is private repository (default true)
+      --repository string   GitHub repository name
+```
+
+### 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
+      --version string       toolkit tag or branch (default "master")
+```
+
+### SEE ALSO
+
+* [tk bootstrap](tk_bootstrap.md)	 - Bootstrap commands
+
+###### Auto generated by spf13/cobra on 9-Jun-2020