Implement entity creation

Closes #6 (closed).

packages/demo/package.json

@@ -4,6 +4,7 @@
   "main": "index.js",
   "license": "MIT",
   "dependencies": {
+    "@logilab/cwclientlibjs": "^1.1.0",
     "@types/react": "^17.0.1",
     "@types/react-dom": "^17.0.0",
     "ra-core": "^3.12.0",
@@ -7,7 +8,7 @@
     "@types/react": "^17.0.1",
     "@types/react-dom": "^17.0.0",
     "ra-core": "^3.12.0",
-    "ra-cubicweb": "^1.0.0",
+    "ra-cubicweb": "^0.1.0",
     "react": "^17.0.1",
     "react-admin": "^3.12.0",
     "react-dom": "^17.0.1"