testnet writeup

[gitaaron]

Here is the testnet writeup we will be sending out to volunteer testers.

• What is testnet?
• What does it include?
• How to get started
• How to report bugs etc.
• update testnet docs writeup to point people to a specific commit ID (tag) for cluster readme
• instructions for connecting Fotos to as Box (blocked by : log multiaddr box#225 )
• get @mehdibalouchi to include video for last step for sharing use case
• get @mehdibalouchi to review
• make a note that sharing won't work if deep linking is not working on Pixel fx-fotos#221 is not fixed
• change from app center to google play store / iOS store if we are making it available (@ghorbani-m )
• send to Aaron M. for review / apply his changes