Add README

examples/video/README.md

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+## Example code for uploading a video
+
+1. First, get a token by `com.atproto.server.getServiceAuth`.
+
+2. Call uploadVideo against the video service (`video.bsky.app`) with the token.
+
+3. Call `app.bsky.video.getJobStatus` against the video service as well.
+
+(The same goes for `app.bsky.video.getUploadLimits`, which gets a token and calls the video service with it to get the data, but the process of checking this may be omitted.)
+
+In Atrium:
+
+- Since `AtpAgent` cannot process XRPC requests with the token obtained by `getServiceAuth`, we need to prepare a dedicated Client and create an `AtpServiceClient` that uses it.
+- The `app.bsky.video.uploadVideo` endpoint is special (weird?) and requires special hacks such as adding query parameters to the request URL and modifying the response to match the schema.