Add a new requirements for PR to checklist

docs/CheckList.md

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+# Commit check list
+## Coding Conventions 
+### Django app
+- [ ] An app's name should be short, all-lowercase and not include numbers, dashes, periods, spaces, or special characters. It also, in general, should be the plural of an app's main model, so our  `posts`  app would have a main model called  `Post`.
+### Files(Modules)
+- [ ] Modules should have short, all-lowercase names. Underscores can be used in the module name if it improves readability(E.g `test_model.py`)
+- [ ] Imports are always put at the top of the file.
+- [ ] Imports form the same module should be separated with ' , ' (E.g `from secondery_model import item1, item 2`).
+### Models(Classes)
+ - [ ] Models name should be in CapWords(E.g `MyModel` )
+ - [ ] **Be careful not to choose a similar name to Django's default models names like `User`**
+ - [ ] **Variables** and **functions** names should be lowercase, with words separated by underscores(i.e `first_name` and `calc_average`)
+ - [ ] functions names should be significant.
+ - [ ] Instance methods should always receive `self` as first argument
+ - [ ] Class methods should always receive `cls` as first argument
+ - [ ] Constants should be defined in the module level and be written in capital letters with underscores separating words(E.g `MAX_LENGTH`)
+ - [ ] Strings should be consistent when using quotes. Use quote or double quote, not both.
+### Blank lines
+ - [ ] Surround top-level function and class definitions with two blank lines.
+ - [ ] Method definitions inside a class are surrounded by a single blank line.
+### Tests
+ - [ ] Each test should have a comment above it to describe the test's purpose.
+ - [ ] If the test expect `Exception` use `pytest.rise`
+ - [ ] To test several invalid value test cases use `parametrize`.
+## Run Pytest and flake8 
+Inside the vagrant Virtual machine and inside the `/vagrant` folder
+ - [ ] pipenv run python -m pytest -v
+ - [ ] pipenv run flake8 --max-line-length 120
+## Requirements for PR
+- [ ] Add pictures for PR that contain view change.