Add initial project structure, including README, CONTRIBUTING, and documentation files

- Created .gitignore to exclude unnecessary files
- Added README.md with project description and core features
- Introduced CONTRIBUTING.md for development guidelines
- Established documentation files for architecture, quality requirements, and technical risks

.gitignore

@@ -0,0 +1,20 @@
+# agents
+.agents/
+.clinerules/
+.cursor/
+.github/instructions/
+.github/copilot-instructions.md
+.opencode/
+.windsurf/
+AGENTS.md
+skills-lock.json
+
+# environment files
+.env
+
+# node modules
+node_modules/
+
+# build and test outputs
+dist/
+coverage/