Add blurb to config.json

config.json

 {
   "language": "Java",
   "active": true,
+  "blurb": "Java is a very widely used Object Oriented programming language. Having few low level features makes it safer and easier to use than languages such as C while still being very powerful.",
   "exercises": [
     {
       "uuid": "f77dc7e3-35a8-4300-a7c8-2c1765e9644d",