add code linting and formatting files

.flake8

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+[flake8]
+ignore = E261, E501, W293
+max-line-length = 79
+exclude = __init__.py, build

.isort.cfg

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+[isort]
+line_length=79
+multi_line_output=3
+length_sort=true
+known_standard_library=numpy,setuptools
+known_myself=torchreid
+known_third_party=matplotlib,cv2,torch,torchvision,PIL,yacs
+no_lines_before=STDLIB,THIRDPARTY
+sections=FUTURE,STDLIB,THIRDPARTY,myself,FIRSTPARTY,LOCALFOLDER
+default_section=FIRSTPARTY

.style.yapf

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+[style]
+BASED_ON_STYLE = pep8
+BLANK_LINE_BEFORE_NESTED_CLASS_OR_DEF = true
+BLANK_LINE_BEFORE_MODULE_DOCSTRING = true
+BLANK_LINE_BEFORE_CLASS_DOCSTRING = true
+SPLIT_BEFORE_EXPRESSION_AFTER_OPENING_PAREN = true
+DEDENT_CLOSING_BRACKETS = true
+SPACES_BEFORE_COMMENT = 1
+ARITHMETIC_PRECEDENCE_INDICATION = true

linter.sh

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+isort -y -sp .
+
+yapf -i -r -vv . -e build