more build docs and docs on rust module s

docs/src/getting-started/building-the-os.md

@@ -12,6 +12,15 @@ Baseline build dependencies:
 - 100GiB+ of additional free storage space for a typical build of the entire
   OS for a multiarch device.
 
+Setup for Debiand GNU/Linux 12 (bookworm) based systems:
+
+```bash
+sudo apt update
+sudo apt install repo yarnpkg zip rsync
+echo 'export PATH=$PATH:/sbin:/usr/sbin:/usr/local/sbin' >> ~/.bashrc
+source ~/.bashrc
+```
+
 More detailed dependiencies and build guide can be found
 [here](https://grapheneos.org/build)
 

docs/src/getting-started/rust-android-module.md

@@ -0,0 +1,35 @@
+# Rust Modules in Android OS
+
+This will follow the hello rust example from AOSP documentation
+[here](https://source.android.com/docs/setup/build/rust/building-rust-modules/hello-rust-example)
+
+Before following this example, make sure your system meets the minimum requirements, and
+go through the AOSP setup steps [here](https://source.android.com/docs/setup/start)
+
+use
+```bash
+lunch aosp_cf_x86_64_phone-trunk_staging-eng
+```
+for the build command
+
+## Android Services
+
+[Documentaiont](https://developer.android.com/develop/background-work/services)
+
+Main idea: servies are long-running operations in the background that can be accessed mby multiple devices.
+This is what we want for the light client, and is how Ethereum Phone implements their light client.
+
+Must be declared in the manifest file:
+
+```html
+<manifest ... >
+  ...
+  <application ... >
+      <service android:name=".ExampleService" />
+      ...
+  </application>
+</manifest>
+```
+
+Services can be started or stopped by calling ```startService()``` and ```stopService()```,
+this should be managed by a light client manager app.