Update readme - add bug report instructions

README.md

@@ -2,12 +2,31 @@
 
 Carbon is the Matrix client for Discord and Guilded refugees.
 
+Visit the hosted instance on
+[https://carbon.chat](https://carbon.chat).
+
+## Report bugs and suggest features
+
+Please briefly check this README and the issues page first to make
+sure that the issue/feature is not already known!
+
+- If you already have an account on Gitdab, use the issues page.
+- If you don't have an account, and don't wish to create one, you can
+send an email to the [mailing list].
+
+If something in the interface isn't working as you think it should,
+please provide a screenshot of any messages from the browser devtools
+console. If using the mailing list, attachments aren't supported, so
+you'll have to upload to some image host and post the link.
+
+[mailing list]: https://lists.sr.ht/~cadence/carbon-discuss
+
 ## The dream
 
 Carbon's planned features, compared to Discord and Guilded:
 
 - End to end encryption
-- Free of charge per-account custom emojis and custom emoji packs
+- Free of charge, per-account, custom emojis and custom emoji packs
 - No limit to number of groups you can join at a time
 - Uses the open Matrix and Mumble systems
 - Much better IRC layout
@@ -41,6 +60,7 @@ implemented:
 - Formatting
 - Emojis
 - Reactions
+- Encryption
 - Groups v2
 - Group management
 - Pinned channels
@@ -48,7 +68,13 @@ implemented:
 
 ## The code
 
-### Building
+### Downloading a CI build
+
+Visit [drone CI](https://drone.badat.dev/cadence/Carbon/branches),
+select the branch you want to use, select `b2` on the left, scroll
+down, and open the URL on the last line to download the build.
+
+### Building yourself
 
     npm install -D
     npm run rebuild
@@ -64,3 +90,8 @@ no cache-control header to everything else.
     npm run watch
 
 Files will be rebuilt as you save them.
+
+Use `python3 -m http.server -d build` to serve the build on
+[http://localhost:8000](http://localhost:8000).
+
+(Avoid `npx http-server`, since this applies too much caching.)