rtdb challenge restore

Author: deltaepsilon

realtime-database/challenge.md

@@ -4,3 +4,47 @@ description: Realtime Database Challenge
 
 # Challenge
 
+## Realtime Database
+
+## Find the repo
+
+We'll be working on a branch of our [firelist-react](https://github.com/how-to-firebase/firelist-react) repo named [challenge-rtdb](https://github.com/how-to-firebase/firelist-react/tree/challenge-rtdb).
+
+## Localhost installation
+
+Pull [the repo](https://github.com/how-to-firebase/firelist-react) directly from GitHub...
+
+```text
+git clone https://github.com/how-to-firebase/firelist-react.git
+cd firelist-react
+git checkout challenge-rtdb
+```
+
+## Edit environment files
+
+Update the following files with your own project details:
+
+* `/.firebaserc`
+* `/public/environments/environment.dev.js`
+* `/public/environments/environment.js`
+
+## Start the app
+
+Once you're on the branch, make sure to run `yarn` or `npm install` to get your Node.js dependencies.
+
+Then run `yarn start` or `npm run start` to spin up the development server.
+
+```text
+yarn
+yarn start
+```
+
+## Complete the challenge
+
+Search the codebase for `Challenge Realtime DB` to find all of the challenges.
+
+Read the comments and complete the steps in those files.
+
+- `databse.rules.json`
+- `src/database/set-user-tokens.js`
+