update workflow and readme

Author: jakbin

.github/workflows/publish.yml

@@ -1,7 +1,10 @@
 name: Publish package
 
 on:
-  push
+  push:
+    paths:
+      - build.sh
+      - .github/workflows/publish.yml
 
 jobs:
   build-nodejs-deb:

README.md

@@ -2,4 +2,17 @@
 
 [![All Downloads](https://img.shields.io/github/downloads/jakbin/scrcpy-deb/total.svg)](https://github.com/jakbin/scrcpy-deb)
 
-deb files scrcpy tool
+deb file for scrcpy tool
+
+## How to install
+
+Download deb file from `Releases` section. Then run command :-
+
+```sh
+sudo dpkg -i scrcpy.deb
+```
+
+### Note :-
+
+Version `2.7` is for Ubuntu.
+Version `latest` is for Debian based os like :- Kali Linux.