Add .gitignore, including patterns for OS, Vim, VSCode, Jetbrains and (…

…FreeCodeCampChina#14)

this's good.

.gitignore

@@ -0,0 +1,26 @@
+# OS generated files
+.DS_Store
+.DS_Store?
+._*
+.Spotlight-V100
+.Trashes
+ehthumbs.db
+Thumbs.db
+
+# Vim
+[._]*.s[a-v][a-z]
+[._]*.sw[a-p]
+[._]s[a-rt-v][a-z]
+[._]ss[a-gi-z]
+[._]sw[a-p]
+Session.vim
+
+# VSCode
+.vscode/*
+
+# Jetbrains
+.idea/
+
+# Sublime
+*.sublime-workspace
+