Add initial project structure and configurations

- Set up project directories including app structure.
- Add IntelliJ IDEA project files and configurations.
- Implement basic PHP router for request handling.
- Provide reference files for features, IPs, and documentation.
- Include license and copyright files.

.idea/.gitignore

@@ -0,0 +1,10 @@
+# Default ignored files
+/shelf/
+/workspace.xml
+# Ignored default folder with query files
+/queries/
+# Datasource local storage ignored files
+/dataSources/
+/dataSources.local.xml
+# Editor-based HTTP Client requests
+/httpRequests/