readme for rustlib

Author: SGI-CAPP-AT2

rust/README.md

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+`For dart file generation`  
+`flutter_rust_bridge_codegen generate \`  
+  `--rust-input crate::api \`  
+  `--rust-root rust \`  
+  `--dart-output lib/bridge/bridge_generated.dart`
+
+`For Compiling RustLib to android`  
+`cargo ndk -t arm64-v8a -t armeabi-v7a -t x86 -t x86_64 -o ../android/main/app/src/main/jniLibs build`
+
+- [ ] `these targets are not added yet`
+
+`For running application`  
+`[fvm] flutter run –flavor {production/nightly}`
+
+`For Compiling/Building apk`  
+`[fvm] flutter build apk –-flavor production`
+
+* `Nightly is only for CI`