feat(query): Add query support

[Mayank1791989]

Features

• add query support.
• add new commands findRefs, getInfo.
• add README.

BREAKING CHANGE:

• change GQLService api.

[codecov-io]

Current coverage is 67.93% (diff: 62.95%)

Merging #2 into master will decrease coverage by 18.05%

@@             master         #2   diff @@
==========================================
  Files            15         45    +30   
  Lines           464       1154   +690   
  Methods           0          0          
  Messages          0          0          
  Branches          0          0          
==========================================
+ Hits            399        784   +385   
- Misses           65        370   +305   
  Partials          0          0          

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