Add prepare script and repository field for git-dependency installs

Not published to npm, so consumers install it as a git dependency. npm only
runs devDependencies + the prepare lifecycle script for git deps (unlike a
registry install, which skips devDependencies and ships prebuilt dist/ instead),
so without this, dist/ would be missing on install.

package.json

@@ -10,7 +10,8 @@
   "scripts": {
     "build": "tsc -p tsconfig.json",
     "dev": "tsc -p tsconfig.json --watch",
-    "prepublishOnly": "npm run build"
+    "prepublishOnly": "npm run build",
+    "prepare": "npm run build"
   },
   "keywords": [
     "electron",
@@ -21,6 +22,10 @@
     "v8"
   ],
   "license": "MIT",
+  "repository": {
+    "type": "git",
+    "url": "https://git.oxmc.me/oxmc/electron-performance.git"
+  },
   "peerDependencies": {
     "electron": ">=20.0.0"
   },