JSON parser

• My attempt at solving the challenge given in the above link
• It was good learning experience overall to be able to validate only the test json files
• I might add some more feature in it, but till then it is good enough

NOTE FOR DEVELOPER: To test the package, write a json file in the testdata dir, and run the command make test

If want to test the valid json file, the name must include valid init

• Preferably the format should be valid.json, valid1.json and so on

If want to test the invalid json file, the name must include invalid init

• Preferably the format should be invalid.json, invalid1.json and so on