Add context7.json with URL and public key (tldraw#7242)

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### Change type

- [ ] `bugfix`
- [ ] `improvement`
- [ ] `feature`
- [ ] `api`
- [x] `other`

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Author: steveruizok

context7.json

@@ -0,0 +1,4 @@
+{
+  "url": "https://context7.com/tldraw/tldraw",
+  "public_key": "pk_pMHtZZcPXLY8ti5lsBvjP"
+}