Added int/uint types

[LimitR]

Added int/uint type
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• Fork the repository and create your branch from master. (small change, ran it though)
• Run npm install in the repository root.
• If you've fixed a bug or added code that should be tested, add tests!
• Ensure the test suite passes (npm test).

Note. If you find a typo in the documentation, make sure to modify the corresponding source (docs are generated).

[LimitR]

Created a constructor for int/uint types

const myTypeNumber = int(4);
const myNumber: myTypeNumber = 7;
// But
const myNumber: myTypeNumber = 8; // Error validation