ADD: badge r eadme for build

Author: 9and3

README.md

@@ -1,4 +1,8 @@
 # diffCheck
+<p align="left">
+    <img src="https://github.com/diffCheckOrg/diffCheck/actions/workflows/windows-build.yml/badge.svg">
+</p>
+
 Temporary repository for diffCheck
 
 ## Roadmap
@@ -69,4 +73,4 @@ See the [CONTRIBUTING.md](https://github.com/diffCheckOrg/diffCheck/blob/main/CO
 ## TODO:
 - [ ] @Andrea: add writing functions for mesh and point cloud
 - [ ] @Andrea: refactor `IOManager.hh` with a class `IOManager` and static methods
-- [ ] @Andrea: test Rhino exporeted `.ply` files
+- [ ] @Andrea: test Rhino exporeted `.ply` files