Added RuboCop static code analyzer

[iamrajiv]

Fixes: #4

[Uditgulati]

Fix the RuboCop test and get the whole thing to work locally (also post some evidence that it works fine like screenshots or some output that RuboCop gives) then put a comment that it's done, I'll have a look then.

Ignore the ruby-head test, it's failing in the repo too.

[iamrajiv]

@Uditgulati I think RuboCop linter is failing because GitHub token is not set for Ruby-Sparse repository.

[Shekharrajak]

Why few checks failed ? Can you please have a look

[iamrajiv]

@Shekharrajak Ruby-Sparse test / test (ubuntu, head) test is failing in the repo too and I think RuboCop linter / lint is failing because the GitHub token is not set for Ruby-Sparse repository.

[Shekharrajak]

@Shekharrajak Ruby-Sparse test / test (ubuntu, head) test is failing in the repo too and I think RuboCop linter / lint is failing because GitHub token is not set for Ruby-Sparse repository.

Do we have open issue for this ? If not, then please open one so that we can track it and someone pick this task.

[iamrajiv]

@Shekharrajak I have opened an issue #13 on Ruby-Sparse test / test (ubuntu, head) test.