Add requirements.txt

requirements.txt

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+appdirs==1.4.4
+atomicwrites==1.4.0
+attrs==20.2.0
+black==20.8b1
+click==7.1.2
+colorama==0.4.4
+iniconfig==1.1.1
+Jinja2==2.11.2
+marko==0.9.1
+MarkupSafe==1.1.1
+mypy-extensions==0.4.3
+packaging==20.4
+pathspec==0.8.0
+pluggy==0.13.1
+py==1.9.0
+pyparsing==2.4.7
+pytest==6.1.2
+python-frontmatter==0.5.0
+PyYAML==5.3.1
+regex==2020.10.28
+six==1.15.0
+toml==0.10.1
+typed-ast==1.4.1
+typing-extensions==3.7.4.3