Update .gitignore file

.gitignore

@@ -0,0 +1,26 @@
+# Dependencies
+node_modules/
+Backend/node_modules/
+frontend/node_modules/
+
+# Build output
+dist/
+frontend/dist/
+
+# Runtime data
+Backend/data/
+*.log
+npm-debug.log*
+
+# Local environment files
+.env
+.env.local
+.env.*.local
+Backend/.env
+Backend/.env.local
+frontend/.env
+frontend/.env.local
+
+# IDE / OS files
+.idea/
+.DS_Store