created basic project structure

backend/package.json

@@ -0,0 +1,16 @@
+{
+  "name": "gym-tracker-back",
+  "version": "1.0.0",
+  "description": "Gym tracker application back-end",
+  "license": "ISC",
+  "author": "Roger Oriol",
+  "type": "commonjs",
+  "main": "server.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1",
+    "start": "node server.js"
+  },
+  "dependencies": {
+    "express": "^5.1.0"
+  }
+}