add instructions

Signed-off-by: Swapnil Tripathi <swapnil06.st@gmail.com>

uniffi_aries_vcx/README.md

@@ -8,4 +8,15 @@ Core contains a crate which wraps over the `aries-vcx` crate to provide a UniFFI
 Coming soon..
 
 ## Building
-Coming soon..
+This module is distributed in three directories.
+1. `core`: The UniFFI bindings for Aries VCX.
+2. `demo`: Demo application consuming the UniFFI wrapper code.
+3. `scripts`: Contains helper sh scripts to ease the process of setting up, building and generating the UniFFI code.
+
+To set up the Android SDK, NDK and bootstrap the demo application, you can simply run the following scripts in the order:
+1. `android.prepare.sh`: This script will prepare the Android SDK and NDK for your system.
+2. `android.toolchain.sh`: This script will prepare the required android toolchain.
+3. `android.build.sh`: This script will build the UniFFI bindings and will also bootstrap and demo application for the target architecture.
+
+## Support
+Currently the builds have been tested for `arm64 (aarch64)` on a physical device. In the future we plan to support most of the architectures.