Add controller for authenticating with admin name and password

+ Add function to create a JWT with the required payload

package.json

@@ -20,10 +20,13 @@
   "homepage": "https://github.com/detleph/server#readme",
   "dependencies": {
     "@prisma/client": "^3.3.0",
+    "@types/jsonwebtoken": "^8.5.5",
     "@types/node": "^16.10.3",
     "@types/nodemailer": "^6.4.4",
+    "argon2": "^0.28.2",
     "dotenv": "^10.0.0",
     "express": "^4.17.1",
+    "jsonwebtoken": "^8.5.1",
     "nodemailer": "^6.7.0"
   },
   "devDependencies": {