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/project16.iml

@@ -0,0 +1,10 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module type="WEB_MODULE" version="4">
+  <component name="NewModuleRootManager">
+    <content url="file://$MODULE_DIR$">
+      <excludeFolder url="file://$MODULE_DIR$/refs" />
+    </content>
+    <orderEntry type="inheritedJdk" />
+    <orderEntry type="sourceFolder" forTests="false" />
+  </component>
+</module>