Add new atlas checklist (#261)

* Add new atlas checklist

* Update docs/source/community/developers/repositories/brainglobe-atlasapi/index.md

Co-authored-by: Alessandro Felder <[email protected]>

---------

Co-authored-by: Alessandro Felder <[email protected]>

docs/source/community/developers/repositories/brainglobe-atlasapi/index.md

@@ -0,0 +1,36 @@
+# brainglobe-atlasapi
+
+## Adding a new atlas
+The details regarding packaging a new atlas can be found at 
+[adding a new atlas](/documentation/brainglobe-atlasapi/adding-a-new-atlas). Here we outline the steps that follow once 
+the new atlas pull request has been merged:
+
+1. Run the atlas script to generate the new atlas, and double-check it passes our validation.
+2. Upload the `tar.gz` archive to the [GIN atlas repository](https://gin.g-node.org/BrainGlobe/atlases).
+3. Update the [`latest_versions.conf`](https://gin.g-node.org/BrainGlobe/atlases/src/master/last_versions.conf) file.
+4. Add the atlas to the [atlas details](/documentation/brainglobe-atlasapi/usage/atlas-details) page of the website.
+5. Add the atlas to the tables in:
+   * The [BrainGlobe Atlas API documentation](/documentation/brainglobe-atlasapi/index)
+   * The [BrainGlobe Atlas GitHub README](https://github.com/brainglobe/brainglobe-atlasapi/blob/main/README.md)
+   * The [GIN atlas repository README](https://gin.g-node.org/BrainGlobe/atlases/src/master/README.md)
+6. Write a [blog post](/blog/index) describing the new atlas. Make sure to highlight the original developers of the 
+atlas (e.g. via the original publication) and the packager of the atlas if they are not in the core BrainGlobe team. 
+Other details may include:
+   * Background (e.g. why is this species important to study)
+   * Details on the atlas
+   * Images of the atlas
+   * Any specific details about the atlas (e.g. a specific channel that should be used for registration)
+   * Instructions for use (e.g. to visualise the atlas)
+7. Inform the creators of the original atlas (if they did not package it), and offer to help them adopt BrainGlobe 
+if this is of interest. Ideally this should be a follow up to an earlier message informing them of the effort to 
+add the atlas.
+8. Advertise the atlas by linking to the blog post. Where we advertise varies depending on the atlas, but will usually
+include:
+   * [Twitter/X](https://x.com/brain_globe)
+   * [Mastodon](https://mastodon.online/@brainglobe)
+   * [Bluesky](https://bsky.app/profile/brainglobe.bsky.social)
+   * [BrainGlobe Zulip](https://brainglobe.zulipchat.com/)
+
+In addition, we usually post about the atlas in any forum we think will find it useful, e.g. if we think there is a 
+specific research community that may want to use the new atlas. 
+