Created Video avatars ("profile photos") (markdown)

Video-avatars-("profile-photos").md

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+As of layer 116, profiles can now add videos along with their profile photo, which will play when a user opens the profile. However, there are some limitations on the type of videos that can be used. In particular, the profile video requirements are:
+* The file format must be a `.mp4` video (not `.gif` file).
+* The video dimensions must be 800x800 pixels.
+* The maximum video size must be less than 2MB.
+* The maximum video duration must be less than 10 seconds.
+
+This information was originally [posted in Telegram Beta Chat](https://t.me/tgbetachat/325956), later [mentioned in Telethon Chat](https://t.me/TelethonChat/235560).
+
+To [use a video](https://tl.telethon.dev/methods/photos/upload_profile_photo.html) in your profile (as long as the file meets the above criteria):
+
+```python
+from telethon import TelegramClient, functions
+
+client = ...
+
+async def main():
+    await client(functions.photos.UploadProfilePhotoRequest(
+        video='/path/to/video.mp4'
+    ))
+
+client.loop.run_until_complete(main())
+```