feat: add configuration files and scripts for project setup ✨

🚀 Breaking Changes:
- Introduced new environment variables for GitLab API integration
- Added validation script for PR checks
- Updated package.json with new scripts for testing and formatting

📝 Details:
- Added .prettierrc and .eslintrc.json for code formatting and linting
- Created .env.example for environment variable setup
- Updated CHANGELOG.md with recent changes
- Added documentation for GitHub secrets setup

.eslintrc.json

@@ -0,0 +1,24 @@
+{
+  "parser": "@typescript-eslint/parser",
+  "extends": ["eslint:recommended", "plugin:@typescript-eslint/recommended"],
+  "plugins": ["@typescript-eslint"],
+  "parserOptions": {
+    "ecmaVersion": 2022,
+    "sourceType": "module"
+  },
+  "env": {
+    "node": true,
+    "es2022": true,
+    "jest": true
+  },
+  "rules": {
+    "no-console": "warn",
+    "prefer-const": "error",
+    "no-unused-vars": "off",
+    "@typescript-eslint/no-unused-vars": ["error", { "argsIgnorePattern": "^_" }],
+    "@typescript-eslint/explicit-module-boundary-types": "off",
+    "@typescript-eslint/no-explicit-any": "warn",
+    "@typescript-eslint/no-non-null-assertion": "warn"
+  },
+  "ignorePatterns": ["node_modules/", "build/", "coverage/", "*.js"]
+}