add ci badge to README

.github/workflows/linux_cross.yml

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+name: Cross Build (linux)
+
+on:
+  pull_request:
+    branches:
+      - main
+  push:
+    branches:
+      - main
+
+concurrency:
+  # Cancels pending runs when a PR gets updated.
+  group: ${{ github.head_ref || github.run_id }}-${{ github.actor }}
+  cancel-in-progress: true
+
+jobs:
+  build-cross-linux:
+    strategy:
+      fail-fast: false
+      matrix:
+        host: [macos-latest, windows-latest]
+        target: [x86_64-linux-gnu, aarch64-linux-gnu]
+    runs-on: ${{matrix.host}}
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v3
+      - name: Read .zig-version
+        id: zigversion
+        uses: juliangruber/read-file-action@v1
+        with:
+          path: ./.zigversion
+      - name: Install Zig
+        uses: mlugg/setup-zig@v1
+        with:
+          version: ${{ steps.zigversion.outputs.content }}
+      - name: Build examples
+        run: zig build -Dtarget=${{matrix.target}} -Dskip=particle_life examples
+

.github/workflows/linux_native.yml

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+name: Native Build (linux)
+
+on:
+  pull_request:
+    branches:
+      - main
+  push:
+    branches:
+      - main
+
+concurrency:
+  # Cancels pending runs when a PR gets updated.
+  group: ${{ github.head_ref || github.run_id }}-${{ github.actor }}
+  cancel-in-progress: true
+
+jobs:
+  build-linux:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v3
+      - name: Read .zig-version
+        id: zigversion
+        uses: juliangruber/read-file-action@v1
+        with:
+          path: ./.zigversion
+      - name: Install Zig
+        uses: mlugg/setup-zig@v1
+        with:
+          version: ${{ steps.zigversion.outputs.content }}
+      - name: Install sdl2
+        run: |
+          sudo apt-get update
+          sudo apt-get install libsdl2-dev
+      - name: SDL version
+        run: sdl2-config --version
+      - name: Check format
+        continue-on-error: true
+        run: zig fmt --check .
+      - name: Build and run tests
+        run: zig build test
+      - name: Build examples
+        run: zig build -Dskip=particle_life,intersection_2d examples

.github/workflows/macos_native.yml

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+name: Native Build (macos)
+
+on:
+  pull_request:
+    branches:
+      - main
+  push:
+    branches:
+      - main
+
+concurrency:
+  # Cancels pending runs when a PR gets updated.
+  group: ${{ github.head_ref || github.run_id }}-${{ github.actor }}
+  cancel-in-progress: true
+
+jobs:
+ #  build-macos:
+ #    runs-on: macos-latest
+ #    steps:
+ #      - name: Checkout repository
+ #        uses: actions/checkout@v3
+ #      - name: Read .zig-version
+ #        id: zigversion
+ #        uses: juliangruber/read-file-action@v1
+ #        with:
+ #          path: ./.zigversion
+ #      - name: Install Zig
+ #        uses: mlugg/setup-zig@v1
+ #        with:
+ #          version: ${{ steps.zigversion.outputs.content }}
+ #      - name: Install sdl2
+ #        run: brew install sdl2
+ #      - name: Build and run tests
+ #        run: zig build test
+ #      - name: Build examples
+ #        run: zig build examples

.github/workflows/windows_cross.yml

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+name: Cross Build (windows)
+
+on:
+  pull_request:
+    branches:
+      - main
+  push:
+    branches:
+      - main
+
+concurrency:
+  # Cancels pending runs when a PR gets updated.
+  group: ${{ github.head_ref || github.run_id }}-${{ github.actor }}
+  cancel-in-progress: true
+
+jobs:
+  build-cross-windows:
+    strategy:
+      fail-fast: false
+      matrix:
+        host: [ubuntu-latest, macos-latest]
+    runs-on: ${{matrix.host}}
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v3
+      - name: Read .zig-version
+        id: zigversion
+        uses: juliangruber/read-file-action@v1
+        with:
+          path: ./.zigversion
+      - name: Install Zig
+        uses: mlugg/setup-zig@v1
+        with:
+          version: ${{ steps.zigversion.outputs.content }}
+      - name: Download SDL2 (MinGW)
+        uses: carlosperate/[email protected]
+        with:
+          file-url: https://www.libsdl.org/release/SDL2-devel-2.30.9-mingw.tar.gz
+          file-name: SDL2.tar.gz
+          location: .
+      - name: Extract SDL2
+        uses: brunoborges/justextract@v1
+        with:
+          file: SDL2.tar.gz
+      - name: Create SDK file
+        uses: DamianReeves/[email protected]
+        with:
+          path: .build_config/sdl.json
+          contents: |
+            {
+              "x86_64-windows-gnu": {
+                "include": "SDL2-2.30.9/x86_64-w64-mingw32/include",
+                "libs": "SDL2-2.30.9/x86_64-w64-mingw32/lib",
+                "bin": "SDL2-2.30.9/x86_64-w64-mingw32/bin"
+              }
+            }
+          write-mode: overwrite
+      - name: Build examples
+        run: zig build -Dtarget=x86_64-windows-gnu -Dskip=particle_life examples