add readme

Readme.md

+# HackITM #6 Fediverse Experimente
+
+```sh
+git clone git@gitlab.ard.de:Andreas.Hubel/hackitm-activity-pub.git
+cd hackitm-activity-pub
+npm install
+npm run dev
+```
\ No newline at end of file

package.json

 {
   "name": "activity-pub-audiothek",
   "version": "0.1.0",
-  "main": "mapping1.ts",
+  "main": "src/server.ts",
   "license": "MIT",
+  "scripts": {
+    "dev": "ts-node-dev src/server.ts"
+  },
   "dependencies": {
     "@urql/core": "^5.1.1",
     "express": "^4.21.2",
     "typescript": "^5.8.2"
   },
   "devDependencies": {
-    "@types/express": "^5.0.0"
+    "@types/express": "^5.0.0",
+    "ts-node-dev": "^2.0.0"
   }
-}
+}
\ No newline at end of file