Pyangle

- Update README.md Guidance For Use

> For Example
python
>>> str(a1 + a2)

- Override `hash()`
- Add complementary/supplementary angle judges
- Update input types hints

- Edit `__cmp__()`
- Test cases of `.sort()` passed

- Refactor Angle with `Fraction`
- Fully use factory methods instead of single creator and adapt `Fraction`
- Switch `XY` to `atan2`
- Add `decimal` param into `to_fmt_str`
- Update test cases

- Support `pip install PyAngle`

- Finish 7methods of `is...Angle()`
- Correct floats comparing(use `math.isclose()`), as well as set private const for that