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/modules.xml

@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="ProjectModuleManager">
+    <modules>
+      <module fileurl="file://$PROJECT_DIR$/.idea/project16.iml" filepath="$PROJECT_DIR$/.idea/project16.iml" />
+    </modules>
+  </component>
+</project>