add github build action

.github/workflows/build.yml

@@ -0,0 +1,15 @@
+name: Build
+on: push
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+    - name: Checkout Code
+      uses: actions/checkout@v4
+    - name: Set up Go
+      uses: actions/setup-go@v5
+      with:
+        go-version: '>=1.20.0'
+    - name: Build
+      run: go build -v
+

README.md

@@ -1,3 +1,5 @@
+![Go Build](https://github.com/aarzilli/nucular/actions/workflows/build.yml/badge.svg)
+
 Mostly-immediate-mode GUI library for Go.
 Source port to go of an early version of [nuklear](https://github.com/vurtun/nuklear).