feat(android): F-Droid release

**Is your feature request related to a problem? Please describe.**

**Describe the solution you'd like**
F-Droid is an Android app repository for free and open-source applications, if Keyman is available at F-Droid, anyone who uses F-Droid would be allowed to install and update Keyman.

**Describe alternatives you've considered**

---

**Keyman for Windows/macOS/Linux:**
- OS:
- Keyman version:
- Target Application:

**Keyman for iPhone/iPad/Android:**
- Device:
- OS:
- Keyman version
- Target application:

**KeymanWeb:**
- OS:
- Browser:
- KeymanWeb Version:
- URL:

**Keyman Developer:**
- OS:
- Keyman Developer version:

---

**Keyboard**
- Keyboard name:
- Keyboard version:
- Language name:

**Additional context**