Adds draft event.

35.md

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+NIP-35
+======
+
+Draft Events 
+------------
+
+`draft` `optional`
+
+This NIP defines kind `31234` as a private draft event for any other event kind. 
+
+The draft event is JSON-stringified, [NIP44-encrypted](44.md) to the owner's public key and placed inside the `.content` of the event.
+
+An additional `k` tag identifies the kind of the draft event. 
+
+```js
+{
+  "kind": 31234,
+  "tags": [
+    ["d", "<identifier>"],
+    ["k", "<kind of the draft event>"],
+  ],
+  "content": nip44Encrypt(JSON.stringify(draft_event)),
+  // other fields
+}
+```