Add git-cherry-pick-by-patch command

plugins/git/commands/cherry-pick-by-patch.md

@@ -0,0 +1,50 @@
+---
+argument-hint: <commit_hash>
+description: Cherry-pick git commit into current branch by "patch" command
+---
+
+## Name
+git:cherry-pick-by-patch
+
+## Synopsis
+```
+/git:cherry-pick-by-patch commit_hash
+```
+
+## Description
+
+The `/git-cherry-pick-by-patch commit_hash` command cherry-picks commit with hash
+`commit_hash` into current branch. Rather then doing `git cherry-pick commit_hash`,
+the command streams the output of `git show commit_hash` to
+`patch -p1 --no-backup-if-mismatch`, and then commit changes with commit message
+from `commit_hash` commit.
+
+## Workflow
+
+### Pre-requisites
+
+The commit with hash `commit_hash` must exist. To verify that use:
+```bash
+git show commit_hash
+```
+and check if exit code is zero.
+
+Fail, if there is no `commit_hash` in the current repository checkout.
+
+### Cherry-pick `commit_hash` into current branch
+
+1. Execute command
+    ```bash
+    git show commit_hash | patch -p1 --no-backup-if-mismatch
+    ```
+and check if exit code is zero. Fail if exit code is not zero.
+
+2. Find files removed from local checkout by the patch command and execute `git rm` for them.
+
+3. Find files added or modified by the patch command and execute `git add` for them.
+
+4. Commit changes by `git commit` command and use commit title and description from `commit_hash` commit.
+
+## Arguments
+
+- **$1** (required): Commit hash (e.g., `902409c0`) of commit to cherry-pick.