add package and rollup to libs

src/Umbraco.Web.UI.Client/libs/context-api/package.json

@@ -0,0 +1,20 @@
+{
+	"name": "@umbraco-cms/context-api",
+	"version": "0.0.0",
+	"description": "",
+	"module": "index.js",
+	"type": "module",
+	"files": [
+		"dist"
+	],
+	"scripts": {
+		"build": "rollup -c",
+		"test": "echo \"Error: no test specified\" && exit 1"
+	},
+	"dependencies": {
+		"lit": "^2.6.1",
+		"@umbraco-cms/element": "^0.0.0"
+	},
+	"author": "Umbraco HQ",
+	"license": "MIT"
+}

src/Umbraco.Web.UI.Client/libs/context-api/rollup.config.js

@@ -0,0 +1,4 @@
+import config from '../../utils/rollup.config.js';
+export default {
+	...config,
+};