[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**

Start by checking the repository root for an existing app.properties file and locating the default template contents referenced in the issue. Review each entry against the project and its repositories, then confirm that Facebook tools and BuildforSDG contributions are listed where applicable. Done means the file is present and all required entries are filled with accurate values; note that merged pull requests already address this issue.

Written by the indexing model from the issue text.