git-mv: add page

pages/common/git-mv.md

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+# git mv
+
+> Move or rename files and update the git index.
+
+- Move file inside the repo and add the movement to the next commit
+
+`git mv {{path/to/file}} {{new/path/to/file}}`
+
+- Rename file and add renaming to the next commit
+
+`git mv {{filename}} {{new_filename}}`
+
+- Overwrite the file in the target path if it exists
+
+`git mv --force {{file}} {{target}}`