feat: add development guideline file (#99)

DEVELOPMENT.md

@@ -0,0 +1,92 @@
+# Development Guide
+
+## Development Requirements
+
+- Java 11 (for development/compilation)
+- Gradle
+- Git
+
+Note: The generated SDKs require Java 8+ for runtime usage.
+
+## Quick Start
+
+### 1. Clone the Repository
+
+```bash
+git clone https://github.com/ExpediaGroup/lodging-connectivity-java-sdk.git
+cd lodging-connectivity-java-sdk
+```
+
+### 2. Initialize GraphQL Module
+
+```bash
+./scripts/graphql/init.sh
+```
+
+This script pulls the required GraphQL schema from the dependent repository.
+
+### 3. Build the Project
+
+Full build with local Maven publication:
+
+```bash
+./gradlew clean generateApolloSources build publishToMavenLocal
+```
+
+Alternatively, for local development you can use:
+
+```bash
+./gradlew clean build
+```
+
+## Project Structure
+
+```
+lodging-connectivity-java-sdk/
+├── code/src/main/
+│   ├── graphql/         # GraphQL schema and queries (Sub module)
+│   └── kotlin/          # Kotlin source code of the SDK
+├── examples/
+│   └── src/main/java/   # Example usage of the SDK in Java
+├── docs/                # Documentation files
+├── scripts/
+│   └── graphql/         # GraphQL setup scripts
+├── apollo-compiler-plugin/
+│   └── src/main/        # Apollo compiler plugin source code
+├── build.gradle         # Gradle build configuration
+├── gradle.properties    # Gradle properties
+├── settings.gradle      # Gradle settings
+└── ...
+```
+
+## Common Issues
+
+### 1. Gradle Cannot Detect JDK
+
+If Gradle fails to detect your JDK installation, try either:
+
+**Option 1**: Add this line to the root `gradle.properties`:
+
+```properties
+org.gradle.java.installations.fromEnv=true
+```
+
+**Option 2**: Set JAVA_HOME explicitly:
+
+```bash
+export JAVA_HOME=$(/usr/libexec/java_home -v 11)
+```
+
+### 2. Build Failures
+
+- Ensure Java 11 is installed and configured as your development JDK
+- Check your Java version: `java -version`
+- Make sure you've run the GraphQL module initialization script
+- Run with `--stacktrace` flag for detailed error information:
+  ```bash
+  ./gradlew build --stacktrace
+  ```
+
+## Questions or Issues?
+
+Create an issue in the GitHub repository with details about your problem.