Merge pull request #27 from cloudflavor/docs/update-readme

docs: Update readme with existing commands.

README.md

@@ -1,3 +1,24 @@
 # oscar
 
-A GitOps automation bot for VCS platforms that is hosted on Cloudflare Workers.
+Oscar is a bot inspired by [Prow](https://docs.prow.k8s.io/docs/).
+And just like Prow, Oscar is a bot that helps you manage your GitHub repositories.
+It can answer to commands in the comments of your PRs and Issues such
+as:
+
+- `/assign`: Assigns a user to the PR or Issue. Without a user, it will assign the PR or
+  Issue to the commenter.
+- `/unassign`: Unassigns a user from the PR or Issue.
+- `/merge`: Merges the PR. This depends on a few conditions such as the PR being
+  approved, the jobs finishing successfully and the PR not having the `do-not-merge`
+  label. 
+- `/close`: Closes the PR or Issue.
+- `/reopen`: Reopens the PR or Issue.
+- `/label`: Adds a label to the PR or Issue.
+- `/triage`: Remove the `needs-triage` label from the PR or Issue.
+- `/rename`: Renames the PR or Issue.
+- `/reviewers`: Adds reviewers to the PR.
+- `/restart-workflow`: Restarts the workflow of the PR.
+- `/stop-workflow`: Stops the workflow of the PR.
+- `/cancel-workflow`: Force cancels the workflow of the PR. Use this only if the workflow
+  is stuck.
+- `/restart-job`: Restarts a specific job of the PR.