Update README.md

put screenshots side by side

Author: thomasthaddeus

README.md

@@ -44,9 +44,9 @@ The Android QR Code Generator is a versatile app that allows users to create cus
 
 ## Screenshots
 
-- ![pic1](assets/img/Screenshot_20231214_150355.png)
-- ![pic2](assets/img/Screenshot_20231214_150500.png)
-- ![pic3](assets/img/Screenshot_20231214_150524.png)
+| pic1                                               | pic2                                               | pic3                                               |
+| :------------------------------------------------: | :------------------------------------------------: | :------------------------------------------------: |
+| ![pic1](assets/img/Screenshot_20231214_150355.png) | ![pic2](assets/img/Screenshot_20231214_150500.png) | ![pic3](assets/img/Screenshot_20231214_150524.png) |
 
 ## Contributing