Add the MIT licence and the F-Droid listing

"Do whatever you like with it" isn't an SPDX identifier, and without one
F-Droid won't take the app at all. Same intent, now in a form a machine
can read.

The listing lives in fastlane/metadata/android/en-US/ so F-Droid reads it
out of the repo and it stays in version control: title, a 65-character
summary, a description adapted from the README that leads with the empty
permission list, a changelog and four screenshots.

The screenshots are generated from the same HTML the app runs, at
1170x2532. The harness freezes the render loop once the wanted frame is
painted — a headless capture otherwise lands whenever the virtual clock
runs out, by which time the delay bar has always finished draining, and
the delay is the thing worth showing. Shot one is a 5-point match at 2-1
with the bar half spent; the others are the score sheet, the settings
sheet from a pristine match (the gear is gone once a match is running, so
that is the only honest way to show it), and a 1-point game with the
score chrome absent.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

LICENSE

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2026 Hans de Zwart
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.