git-config: add page

pages/common/git-config.md

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+# git config
+
+> Get and set repository or global options
+
+- Print list of options for current repository
+
+`git config --list --local`
+
+- Print global list of options, set in ~/.gitconfig
+
+`git config --list --global`
+
+- Get full list of options
+
+`git config --list`
+
+- Get value of alias.ls option
+
+`git config alias.st`
+
+- Set option alias.ls=status in file ~/.gitconfig
+
+`git config --global alias.ls "status"`
+
+- Remove option alias.st from ~/.gitconfig
+
+`git config --global --unset alias.st`