move `imeta` to NIP-92, add `imeta` tag to README.

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+NIP-92
+======
+
+Media Attachments
+-----------------
+
+Media attachments (images, videos, and other files) may be added to events by including a URL in the event content, along with a matching `imeta` tag.
+
+`imeta` ("inline metadata") tags add information about media URLs in the event's content. Each `imeta` tag SHOULD match a URL in the event content. Clients may replace imeta URLs with rich previews.
+
+The `imeta` tag is variadic, and each entry is a space-delimited key/value pair.
+Each `imeta` tag MUST have a `url`, and at least one other field. `imeta` may include
+any field specified by [NIP 94](./94.md). There SHOULD be only one `imeta` tag per url.
+
+## Example
+
+```json
+{
+  "content": "More image metadata tests don’t mind me https://nostr.build/i/my-image.jpg",
+  "kind": 1,
+  "tags": [
+    [
+      "imeta",
+      "url https://nostr.build/i/my-image.jpg",
+      "m image/jpeg",
+      "blurhash eVF$^OI:${M{o#*0-nNFxakD-?xVM}WEWB%iNKxvR-oetmo#R-aen$",
+      "dim 3024x4032",
+      "alt A scenic photo overlooking the coast of Costa Rica",
+      "x <sha256 hash as specified in NIP 94>",
+      "fallback https://nostrcheck.me/alt1.jpg"
+      "fallback https://void.cat/alt1.jpg"
+    ]
+  ]
+}
+```
+
+## Recommended client behavior
+
+When uploading files during a new post, clients MAY include this metadata
+after the file is uploaded and included in the post.
+
+When pasting urls during post composition, the client MAY download the file
+and add this metadata before the post is sent.