Merge pull request #6 from jmatsu/update_readme

Update readme

README.md

@@ -1,3 +1,5 @@
+[![Build Status](https://travis-ci.com/jmatsu/danger-apkstats.svg?branch=master)](https://travis-ci.com/jmatsu/danger-apkstats) [![Gem Version](https://badge.fury.io/rb/danger-apkstats.svg)](https://badge.fury.io/rb/danger-apkstats)
+
 # danger-apkstats
 
 A description of danger-apkstats.
@@ -14,18 +16,32 @@ A description of danger-apkstats.
 # Sample
 
 ```
-apkstats.command_type=:apk_analyzer # required
-apkstats.apk_filepath='app-debug.apk' # required. It would be a base apk.
+apkstats.apk_filepath='app-debug.apk' # required.
 apkstats.compare_with('app-other.apk', do_report: true)
-apkstats.file_size #=> Integer
-apkstats.download_size #=> Integer
-apkstats.required_features #=> Array<String>
-apkstats.non_required_features #=> Array<String>
-apkstats.permissions #=> Array<String>
-apkstats.min_sdk #=> String
-apkstats.target_sdk #=> String
+apkstats.file_size #=> Fixnum
+apkstats.download_size #=> Fixnum
+apkstats.required_features #=> Array<String> | Nil
+apkstats.non_required_features #=> Array<String> | Nil
+apkstats.permissions #=> Array<String> | Nil
+apkstats.min_sdk #=> String | Nil
+apkstats.target_sdk #=> String | Nils
 ```
 
+## Compare apk files
+
+The report will be like below.
+
+### Apk comparision results
+
+Property | Summary  
+:--- | :---
+New File Size | 1621248 Bytes. (1.55 MB
+File Size Change | -13352 Bytes. (-13.04 KB)
+Download Size Change | +41141 Bytes. (+40.18 KB)
+Removed Required Features | - android.hardware.camera
+Removed Non-required Features | - android.hardware.camera.front (not-required)
+Removed Permissions | - android.permission.INTERNET<br>- android.permission.CAMERA
+
 ## Development
 
 1. Clone this repo