initial fastlane structures from IzzyOnDroid

[IzzySoft]

As discussed in #131 here comes the Fastlane starter package. Pointers:

• be welcome to use my Fastlane Cheat Sheet for guidance with working on it. You could e.g. add more screenshots, a featureGraphic and maybe even per-release changelogs. Be aware of the limits: shortdesc must not exceed 80 chars, fulldesc 4,000 chars, per-release changelogs 500 chars; icon must be min 48x48px and max 512x512px, featureGraphic 512x250 or 1024x500; screenshots should be single screenshot files (no combined images) and should not be too heavily framed (ideally, not framed at all – think of small device screens and their screen estate).
• fulldesc as provided here uses "simple HTML", which is what renders best with F-Droid (and thus also my repo). I've "compressed" it to a single line (to avoid having fdroid injecting <br>s for each new line); my updater takes care for that should you have multiple lines, but F-Droid won't. Should you want to change the format, see eg. my Wiki on Fastlane formattings – and alternative could be what I call "Markdown lite", which would also work for PlayStore. Should you change the format, make sure to drop me a note so I adjust configuration here then.

PS: if you wonder, my updater will resize and optimize graphics. Screenshots will always be resized to 350px on their small side, for example. That's done to keep bandwidth low and save "data volume", plus to speed up transfers especially for those at bad connections.

Now, enjoy!

[Kara-Zor-El]

Hey, I've expanded a bit on your FastLane structure for this project. If theres a issue feel free to contact me or re-open this PR

[IzzySoft]

Looks fine, thanks! Enabling it on my end now.