docs: move Termux setup notes into dedicated docs page

Author: calchiwo

README.md

@@ -448,14 +448,11 @@ Use the `--doctor` flag to verify the environment, network connectivity, and API
 explainthisrepo --doctor
 ```
 
-## Termux (Android) install notes
+## Termux (Android)
 
-Termux has some environment limitations that can make `pip install explainthisrepo` fail to create the `explainthisrepo` command in `$PREFIX/bin`.
+ExplainThisRepo supports Termux on Android.
 
-However, it's recommended you install using:
-
-```bash
-pip 
+For installation notes, PATH setup, Gemini support, and mobile-specific recommendations: see [docs/TERMUX.md](https://github.com/calchiwo/ExplainThisRepo/blob/main/docs/TERMUX.md)
 
 ## Philosophy
 

docs/TERMUX.md

@@ -0,0 +1,42 @@
+# Termux (Android) setup notes
+
+ExplainThisRepo supports running inside the Termux environments on Android devices
+
+Termux has some environment limitations that can make `pip install explainthisrepo` fail to create the `explainthisrepo` command in `$PREFIX/bin`.
+
+However, it's recommended you install using:
+
+```bash
+pip install --user -U explainthisrepo
+```
+
+Make sure your user bin directory is on your PATH:
+
+```bash
+export PATH="$HOME/.local/bin:$PATH"
+```
+
+> Tip: Add the PATH export to your `~/.bashrc` or `~/.zshrc` so it persists.
+
+### Alternative (No PATH changes)
+
+If you do not want to modify PATH, you can run ExplainThisRepo as a module:
+
+```bash
+python -m explain_this_repo owner/repo
+```
+
+### Gemini support on Termux
+
+Installing Gemini support may require building Rust-based dependencies on Android, which can take time on first install:
+
+```bash
+pip install --user -U "explainthisrepo[gemini]"
+```
+
+For mobile environments like Termux where compiling Python dependencies can be slow,
+you can also run ExplainThisRepo using the Node.js version:
+
+```bash
+npx explainthisrepo owner/repo
+```