installable through a Package Control channel

repository.json describes vDiff itself; "tags": true means a release is a
pushed git tag. channel.json is the file users add to their "channels"
setting - it holds nothing but repository URLs, so packages added to it
later reach existing users without them changing anything.

The two are easy to confuse: Package Control rejects a file under
"channels" unless it has a top-level "repositories" key, so a repository
file belongs in "repositories". The README spells that out.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

channel.json

@@ -0,0 +1,7 @@
+{
+    "$schema": "sublime://packagecontrol.io/schemas/channel",
+    "schema_version": "4.0.0",
+    "repositories": [
+        "https://raw.githubusercontent.com/vaclavt/vdiff/main/repository.json"
+    ]
+}