Update docs

README.md

@@ -1,2 +1,44 @@
-# Gomi
-Branch delete tool made by golang
+# GOMI
+Branch delete tool made by Golang
+## About
+GOMI is a tool for deleting merged branches in local git repository.
+
+When you write code with git or github flow,
+there are many branches that are already merged into master / develop branch.
+
+You can delete branches merged into your current branch only with
+
+```bash
+gomi
+```
+
+at your project.
+## How to install
+You can install via homebrew
+
+```bash
+brew tap jiko21/gomi
+```
+
+then,
+
+```bash
+brew install gomi
+```
+
+## Features
+
+### branch delete block
+You can specify the branches that you don't want to delete.
+
+You can specify them with `.gomiignore`, on your project root.
+
+If you don't use `.gomiignore`, then default rule will be adopted; `master`, `develop`, `release` cannot be deleted by gomi.
+
+The example of `.gomiignore` is shown below.
+
+```
+master
+do-not-delete-branch
+master-xxx
+```

index.md

@@ -31,3 +31,20 @@ then,
 ```bash
 brew install gomi
 ```
+
+## Features
+
+### branch delete block
+You can specify the branches that you don't want to delete.
+
+You can specify them with `.gomiignore`, on your project root.
+
+If you don't use `.gomiignore`, then default rule will be adopted; `master`, `develop`, `release` cannot be deleted by gomi.
+
+The example of `.gomiignore` is shown below.
+
+```
+master
+do-not-delete-branch
+master-xxx
+```