update readme

run-shell/README.md

@@ -2,4 +2,24 @@
 
 Blurs background and shows widget with run prompts:
 
-![screenshot](./screenshot.png)
+![screenshot](./screenshot.png)
+
+## Install
+
+1. Clone this repo under **~/.config/awesome/**:
+
+    ```bash
+    git clone https://github.com/streetturtle/awesome-wm-widgets.git ~/.config/awesome/
+    ```
+
+1. Require weather widget at the beginning of **rc.lua**:
+
+    ```lua
+    local run_shell = require("awesome-wm-widgets.run_shell.run_shell")
+    ```
+
+1. Use it (don't forget to comment out the default prompt):
+
+    ```lua
+    awful.key({modkey}, "r", function () run_shell.launch() end),
+    ```