Add demo application in kotlin

.editorconfig

@@ -17,6 +17,9 @@ indent_size = 4
 [*.kt]
 indent_size = 4
 
+[*.gradle]
+indent_size = 4
+
 [tests/**/*.rs]
 charset = utf-8
 end_of_line = unset

README.md

@@ -42,3 +42,14 @@ See the [UniFFI User Guide](https://mozilla.github.io/uniffi-rs/)
    1. Use `build.sh` script (TODO do it all in build.rs instead) 
    2. Create tests in `bindings/bdk-kotlin` and/or `bindings/bdk-swift`
    3. Use `test.sh` to run all bindings tests
+
+### Run kotlin demo application
+
+We have a kotlin demo console application which uses bdk.
+It uses stdin for inputs and can be run from gradle.
+
+```sh
+cd bindings/bdk-kotlin
+./gradlew :demo:run
+```
+

build.sh

@@ -32,11 +32,13 @@ copy_lib_kotlin() {
       echo -n "darwin "
       mkdir -p bindings/bdk-kotlin/jvm/src/main/resources/darwin-x86-64
       cp target/debug/libuniffi_bdk.dylib bindings/bdk-kotlin/jvm/src/main/resources/darwin-x86-64
+      cp target/debug/libuniffi_bdk.dylib bindings/bdk-kotlin/demo/src/main/resources/darwin-x86-64
       ;;
     "Linux")
       echo -n "linux "
       mkdir -p bindings/bdk-kotlin/jvm/src/main/resources/linux-x86-64
       cp target/debug/libuniffi_bdk.so bindings/bdk-kotlin/jvm/src/main/resources/linux-x86-64
+      cp target/debug/libuniffi_bdk.so bindings/bdk-kotlin/demo/src/main/resources/linux-x86-64
       ;;
   esac
   echo "libs to kotlin sub-project"