Tsumugi app, release v1.0.0

Note: GitHub ate my tag v1.0.0 so I named this v1.0 instead. Sorry about that 🙏
Tsumugi app, release v1.0.0 (even though it's written v1.0)
Also I updated the launcher icon after setting the tag so make sure to check the commit 304345b if you really want the updated code.