README: add instructions to configure github oauth

Signed-off-by: Vallari <[email protected]>

README.md

@@ -7,6 +7,12 @@ A REST API to execute [teuthology commands](https://docs.ceph.com/projects/teuth
 #### Option 1: (teuthology docker setup)
 
 1. Clone [teuthology](https://github.com/ceph/teuthology) and [teuthology-api](https://github.com/VallariAg/teuthology-api).
+2. Rename `.env.dev` file to `.env`. 
+3. Configure secrets:
+   3.1. Create a Github OAuth Application by following [these](https://docs.github.com/en/apps/oauth-apps/building-oauth-apps/creating-an-oauth-app) instructions. Set "Homepage URL" as `http://localhost:8082/` and "Authorization callback URL" as `http://localhost:8082/login/callback/`. 
+   3.2. Ensure [ceph](https://github.com/ceph) belongs in your public list of organizations[[ref](https://docs.github.com/en/account-and-profile/setting-up-and-managing-your-personal-account-on-github/managing-your-membership-in-organizations/about-organization-membership)]. By default your membership is set private, change that to public by following [these](https://docs.github.com/en/account-and-profile/setting-up-and-managing-your-personal-account-on-github/managing-your-membership-in-organizations/publicizing-or-hiding-organization-membership) steps.
+   3.3. Save `CLIENT_ID` and `CLIENT_SECRET` from your Github OAuth App to your local `.env` file as `GH_CLIENT_ID` and `GH_CLIENT_SECRET`.
+
 2. Add the following to [teuthology's docker-compose](https://github.com/ceph/teuthology/blob/main/docs/docker-compose/docker-compose.yml) services.
     ```
     teuthology_api: