add chinese for pages.cn/linux/add-apt-respository.md

pages.cn/common/git-commit.md

@@ -0,0 +1,15 @@
+# git commit
+
+> Commit files to the repository.
+
+- Commit staged files to the repository with a message:
+
+`git commit -m {{message}}`
+
+- Auto stage all modified files and commit with a message:
+
+`git commit -a -m {{message}}`
+
+- Replace the last commit with currently staged changes:
+
+`git commit --amend`