[FEATURE] Fill in App.Properties

**Is your feature request related to a problem? Please describe.**
No

**Describe the solution you'd like**

1. Create an app.properties file in the root of all project repos and add/replace its contents with the default template contents. Edit the file and provide the required details for each entry. Each entry either has a single value (e.g name and team.name) or a comma-separated list of values (e.g code.languages and repos - if there are multiple repos for the project)

2. Use the code.opensource.Facebook entry to provide a comma-separated list of any Facebook open-source or platform API / tools the repo is using.

3. Finally, use code.opensource.contributions entry to provide a comma-separated list of repos containing code your team has created and open-sourced as a result of innovating in the BuildforSDG program.

**Describe alternatives you've considered**
None

**Additional context**