Create stream-id.md

docs/stream-id.md

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+# Stream ID
+
+A stream ID is a unique identifier for a stream that consists of a channel ID and a feed ID separated by the `@` symbol.
+
+```
+ExampleTV.us@HD
+```
+
+## Channel ID
+
+This is a unique channel ID that consists of the channel name (without spaces or special characters) followed by the country code, separated by a period.
+
+```
+ExampleTV.us
+```
+
+## Feed ID
+
+The Feed ID is simply the name of the feed with all spaces and special characters removed.
+
+It usually indicates the broadcast quality, time shift, source, or broadcast region. For example:
+
+- HD
+- Plus1
+- Pluto
+- WGTQ
+- East
+- MENA
+
+A complete list of all channel and feed IDs can always be found on [iptv-org.github.io](https://iptv-org.github.io/).
+
+If a particular channel is not on the list, you can always add it using this [form](https://github.com/iptv-org/database/issues/new?template=01_channels_add.yml). Similarly, you can use this [form](https://github.com/iptv-org/database/issues/new?template=04_feeds_add.yml) to add a missing feed.