Add RELEASES.md, fill in android releases

RELEASES.md

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+# Android releases
+
+Android version|Core version|GPlay|[F-Droid](https://f-droid.org/packages/com.b44t.messenger/)|Notes
+-|-|-|-|-
+1.46.15|1.145.0|-|-|There as a Changelog.md entry, but no release
+1.46.14|1.142.12|✅ (2024-09-12)|✅ (2024-09-16)
+1.46.13|1.142.8|-|✅ (2024-08-31)
+1.46.10|1.142.2|✅ (2024-08-15)|Tagged, but not on f-droid.org
+1.46.9|1.142.2|-|Tagged, but not on f-droid.org
+1.46.8|1.142.2|✅|Tagged, but not on f-droid.org
+1.46.7|1.140.2|✅|✅
+1.46.5|1.140.2
+1.46.3|1.139.5
+1.46.2|1.139.5
+1.46.1|1.139.5
+1.44.0|1.136.2