More readme updates [no JIRA] (#6135)

README.md

@@ -9,10 +9,27 @@ The [Cromwell documentation has a dedicated site](https://cromwell.readthedocs.i
 
 First time to Cromwell? Get started with [Tutorials](https://cromwell.readthedocs.io/en/stable/tutorials/FiveMinuteIntro/).
 
+### Community
+
 Thinking about contributing to Cromwell? Get started by reading our [Contributor Guide](CONTRIBUTING.md).
 
 Cromwell has a growing ecosystem of community-backed projects to make your experience even better! Check out our [Ecosystem](https://cromwell.readthedocs.io/en/stable/Ecosystem/) page to learn more.
 
+Talk to us:
+- [Join the Cromwell Slack workspace](https://join.slack.com/t/cromwellhq/shared_invite/zt-dxmmrtye-JHxwKE53rfKE_ZWdOHIB4g) to discuss the Cromwell workflow engine.
+- [Join the OpenWDL Slack workspace](https://join.slack.com/t/openwdl/shared_invite/zt-ctmj4mhf-cFBNxIiZYs6SY9HgM9UAVw) to discuss the evolution of the WDL language itself.
+    - More information about WDL is available in [that project's repository](https://github.com/openwdl/wdl).  
+
+### Capabilities and roadmap
+
+A majority of Cromwell users today run their workflows in [Terra](https://app.terra.bio/), a fully-managed cloud-native bioinformatics computing platform. See [here](https://support.terra.bio/hc/en-us/articles/360036379771-Get-started-running-workflows) for a quick-start guide.
+
+Users with specialized needs who wish to install and maintain their own Cromwell instances can [download](https://github.com/broadinstitute/cromwell/releases) a JAR or Docker image. The development team accepts reproducible bug reports from self-managed instances, but cannot feasibly provide direct support.
+
+[Cromwell's backends](https://cromwell.readthedocs.io/en/stable/backends/Backends/) receive development resources proportional to customer demand. The team is actively developing for Google Cloud and AWS. Maintenance of other backends is primarily community-based.
+
+Cromwell [supports](https://cromwell.readthedocs.io/en/stable/LanguageSupport/) the WDL and CWL workflow languages. The Cromwell team is actively developing WDL, while maintenance for CWL is primarily community-based.  
+
 ### Issue tracking in JIRA
 
 <!--
@@ -21,8 +38,8 @@ AEN external issue filing tested 2020-12-08 with `oednichols@gmail.com` / `https
 
 Need to file an issue? Head over to [our JIRA](https://broadworkbench.atlassian.net/jira/software/c/projects/CROM/issues). You must create a free profile to view or create.
 
-![Cromwell JIRA](docs/img/cromwell_jira.png)
+[Issues in Github](https://github.com/broadinstitute/cromwell/issues) remain available for discussion among community members but are not actively monitored by the development team.
 
-Issues in Github remain available for discussion among community members but are not actively monitored by the development team.
+![Cromwell JIRA](docs/img/cromwell_jira.png)
 
 ![Jamie, the Cromwell pig](docs/jamie_the_cromwell_pig.png)