[git] add .gitignore (#87)

Author: cdliang11

.gitignore

@@ -0,0 +1,39 @@
+# Byte-compiled / optimized / DLL files
+__pycache__/
+*.py[cod]
+*$py.class
+*.egg-info
+
+# Visual Studio Code files
+.vscode
+.vs
+
+# PyCharm files
+.idea
+venv
+
+# Eclipse Project settings
+*.*project
+.settings
+
+# Sublime Text settings
+*.sublime-workspace
+*.sublime-project
+
+# Editor temporaries
+*.swn
+*.swo
+*.swp
+*.swm
+*~
+
+# IPython notebook checkpoints
+.ipynb_checkpoints
+
+# macOS dir files
+.DS_Store
+
+exp
+data
+tensorboard
+**/*build*