Create v1.3.0.md, draft of release announcements (#2004)

* Create v1.3.0.md, draft of release announcements * Add some announcements * Update modifications screenshot and remove somewhat duplicated pluginstore screenshot * Add file selector screenshot and color description * Update file selector screenshot Co-authored-by: Colin <[email protected]>
GMOD · May 24, 2021 · e9a3cae · e9a3cae
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+We're excited to announce the v1.3.0 release of JBrowse Web! Some highlights of
+this release include:
+
+## In-app plugin store
+
+Building on the plugin store on our website in the last release, we're now
+excited to announce that plugins can be installed from within JBrowse Web!
+Plugins from our plugin store can now be installed with the click of a button.
+
+![Screenshot of plugin store with MsaView plugin installed and open](https://user-images.githubusercontent.com/19295181/117894797-f9631180-b271-11eb-9c81-69c5aa6ae497.png)
+
+## Open local files
+
+JBrowse Web now has the ability for tracks to use files on your local hard
+drive. This is a great option if you want to visualize files you have locally
+without uploading them to a server. These files will need to be re-opened each
+time the app is opened or refreshed, but more robust handling of local files
+will be available when we release JBrowse Desktop.
+
+![Screenshot of selector in URL and File states](https://user-images.githubusercontent.com/25592344/119404009-6f1ca380-bc9c-11eb-8d77-d8706dfa1d90.png)
+
+## Color by MM and MP/ML tags in BAM/CRAM
+
+The MM and MP/ML tags can be used to color alignments tracks by either base
+modifications or by methylation. The modifications mode is exciting because it
+can show arbitrary DNA/RNA modifications, and the methylation mode uses
+specific CpG context to show both modified and unmodified CpGs.
+
+![Screenshot of alignments tracks colored by methylation and base modification](https://raw.githubusercontent.com/GMOD/jbrowse-components/7f0c725a929bb15a6adfcf3a155bf9dc5f717af7/website/static/img/alignments/modifications1.png)
+
+In this screenshot, the top alignments track is colored by methylation and the
+bottom alignments track is colored by base modification.