Created README.md

Author: MacDada

README.md

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+git_sync.sh 
+===
+
+[![CodeFactor](https://www.codefactor.io/repository/github/macdada/git_sync.sh/badge)](https://www.codefactor.io/repository/github/macdada/git_sync.sh)
+
+A script to synchronise local branch(es) with the latest changes from remote repository.
+
+---
+Usage
+---
+
+* `./git_sync.sh`      – updates current branch with changes from `remote/master`/`remote/main`
+* `./git_sync.sh all`  – updates all branches with changes from `remote/master`/`remote/main`
+* `./git_sync.sh push` – updates `remote/master`/`remote/main` with changes from current branch
+
+---