Update README.md

Added Semgrep CI/CD scan

.github/workflows/semgrep.yml

@@ -0,0 +1,18 @@
+name: Semgrep
+on:
+  pull_request:
+  workflow_dispatch:
+
+jobs:
+  semgrep:
+    name: Run Semgrep 
+    runs-on: ubuntu-latest
+    timeout-minutes: 30
+    container:
+      # A Docker image with Semgrep installed. Do not change this.
+      image: returntocorp/semgrep
+    steps:
+      - uses: actions/checkout@v4
+      - run: semgrep ci
+        env:
+          SEMGREP_APP_TOKEN: ${{ secrets.SEMGREP_APP_TOKEN_PUBLIC }}

README.md

@@ -1,3 +1,7 @@
+Update June 19, 2023: Stitches is no longer actively maintained due to changes in the React ecosystem and maintainer availability. You can <a href="https://github.com/stitchesjs/stitches/discussions/1149#discussioncomment-6223090">read more here</a>.
+
+---
+
 <a href="https://stitches.dev">
   <img alt="stitches" src="https://user-images.githubusercontent.com/372831/112011920-03e21400-8b29-11eb-9c9a-4e14d5a1f575.png" />
 </a>