Add skills files for build and test on Android and Linux

.agents/skills/android/SKILL.md

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+---
+name: Build for Android
+description: Instructions for building for Android
+---
+
+
+# Build instructions
+
+
+To build the project for Android, run the following command from the root of the repository:
+
+
+```
+scripts/android.py
+```
+
+
+# Requirements for running the build script
+
+1. Make sure the `ANDROID_HOME`  environment variable is set. If it's not set,
+   then set it to the default location based on the current operating system.
+
+
+2. Make sure the `ANDROID_NDK_HOME` environment variable is set.  Verify that it's set to NDK version 29 or newer. If it's not set, use the latest NDK version from the $ANDROID_HOME location, but make sure it satisfies the minimum NDK version required.
+
+
+
+3. Use CMake and Ninja from the Android SDK. Make sure they are available in $PATH. Use the `bin/` subdirectory of the CMake package from Android SDK. Make sure the CMake package you are using is version 3.22.1 or newer. 
+
+THe CMake package inside Android SDK also  contains a `ninja` binary next to the `cmake` binary, so you don't need to do anything other than adding that directory to PATH.
+

.agents/skills/linux/SKILL.md

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+---
+name: Build and test for Linux
+description: Instructions for building and testing for Android
+---
+
+# Prerequisites for everything
+
+You must be on a Linux host. If you are on a different host, you cannot build for Linux. Check the current host OS.
+
+If the current host is not Linux, do not proceed. Tell the user that you cannot build for Linux from the current host OS.
+
+
+
+# Build and test instructions
+
+
+To build the project and run the tests, run the following command from the root of the repository:
+
+```
+./scripts/github_ci_linux.py
+```
+
+
+# Requirements for running the builds
+
+1. Use CMake and Ninja from the Android SDK. Make sure they are available in $PATH. Use the `bin/` subdirectory of the CMake package from Android SDK. Make sure the CMake package you are using is version 3.22.1 or newer. 
+
+The CMake package inside Android SDK also  contains a `ninja` binary next to the `cmake` binary, so you don't need to do anything other than adding that directory to PATH.
+
+You will find Android SDK using the ANDROID_HOME environment variable. If it's not set, set it to the default location for the current operating system.
+
+
+
+
+
+