update README

README.md

@@ -1,2 +1,38 @@
 # tson
-tson is JSON viewer written in Go.
+`tson` is JSON viewer written in Go.
+This tool displays JSON as a tree and you can search and edit key or values.
+
+![](https://i.imgur.com/tBGLEsT.gif)
+
+## Installtion
+```sh
+$ git clone https://github.com/skanehira/tson
+$ cd && go install
+```
+
+## Usage
+```sh
+$ tson < test.json
+```
+
+## keybinding
+### json tree
+
+| key    | description         |
+|--------|---------------------|
+| j      | move down           |
+| k      | move up             |
+| g      | move to the top     |
+| G      | move to the bottom  |
+| ctrl-f | page up             |
+| ctrl-b | page down           |
+| h      | hide current node   |
+| H      | collaspe all nodes  |
+| l      | expand current node |
+| L      | expand all nodes    |
+| r      | read from file      |
+| Enter  | edit node           |
+| /      | search nodes        |
+
+# Author
+skanehira