feat: add cryptography app with createHmac action

packages/docs/pages/apps/cryptography/actions.md

@@ -0,0 +1,12 @@
+---
+favicon: /favicons/cryptography.svg
+items:
+  - name: Create HMAC
+    desc: Create a Hash-based Message Authentication Code (HMAC) using the specified algorithm, secret key, and message data.
+---
+
+<script setup>
+  import CustomListing from '../../components/CustomListing.vue'
+</script>
+
+<CustomListing />

packages/docs/pages/apps/cryptography/connection.md

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+# Cryptography
+
+Cryptography is a built-in app shipped with Automatisch, allowing you to perform cryptographic operations without needing to connect to any external services.