Add a core package to be reused by desktop and server

tsconfig.base.json

@@ -28,5 +28,7 @@
     "paths": {
       "~/*": ["./src/*"]
     }
-  }
+  },
+  "include": ["${configDir}/src", "${configDir}/src/**/*.json"],
+  "exclude": ["${configDir}/node_modules", "${configDir}/dist"]
 }