feat(anthropic): add anthropic app with send message action

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

@@ -0,0 +1,12 @@
+---
+favicon: /favicons/anthropic.svg
+items:
+  - name: Send message
+    desc: Sends a structured list of input messages with text content, and the model will generate the next message in the conversation.
+---
+
+<script setup>
+  import CustomListing from '../../components/CustomListing.vue'
+</script>
+
+<CustomListing />