Add README (#65)

Co-authored-by: LonMcGregor <3817332+LonMcGregor@users.noreply.github.com>

Author: illicitonion

README.md

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+# trainee-tracker
+
+A website for tracking trainee progress, which also contains a grab-bag of tools which re-use code and auth.
+
+We hope to replace all of this functionality with a well built system, but for now, it glues together different data sources conveniently.
+
+## Local development
+
+To develop locally, you need a few pieces, which you can configure in a `.env` file:
+
+### Local config
+
+You probably want to set exactly this: `CYF_TRAINEE_TRACKER_PUBLIC_BASE_URL=http://localhost:3000`
+
+### GitHub OAuth app
+
+Set up an OAuth application in https://github.com/settings/developers and set the following env vars:
+
+* `CYF_TRAINEE_TRACKER_GITHUB_CLIENT_ID`
+* `CYF_TRAINEE_TRACKER_GITHUB_CLIENT_SECRET`
+
+### Google OAuth app
+
+Set up an OAuth application in a project in https://console.cloud.google.com/auth/clients/create and set the following env vars:
+
+* `CYF_TRAINEE_TRACKER_GOOGLE_APIS_CLIENT_ID`
+* `CYF_TRAINEE_TRACKER_GOOGLE_APIS_CLIENT_SECRET`
+
+### Slack (optional)
+
+If you want Slack integration (you probably don't), make a Slack App and set `CYF_TRAINEE_TRACKER_SLACK_CLIENT_SECRET=`.
+
+### PR validator bot (optional)
+To allow the PR validator to test things without setting up a github app for the whole tracker, create a token with with pull request permissions and set the following env var:
+* `GH_TOKEN=`