Add information for SOGOps

for-sogops.md

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+# Recommendations for SOGS Operators
+
+## Communication channels
+
+If you operate a Session Group Server, it is recommended that you have a presence in the [Session Open Group Operators Community](https://sessioncommunities.online/#sogops+118d) on caliban.org.
+
+Additionally, you may want to [keep in touch](README.md#contact-us) with the maintainers of SessionCommunities.Online for important notifications and new feature announcements — cooperation with SOGS Operators is crucial to prevent abuse and to enrich Session as a whole.
+
+## Extra features
+
+### Community tags
+
+Due to the lack of progress on the [issue of built-in Community tags](https://github.com/oxen-io/session-pysogs/issues/187), you may insert tags at the end of your room description like so:
+
+```This is a cool chatroom. #cool #chat #free```
+
+The obvious benefit is searchability. However, tags such as `#nsfw` or `#test` also help us automatically hide parts of the Community display.
+
+### Server-wide icons
+
+You may notice the Host column groups Communities by their host SOGS, and some SOGS are easily recognizable by a unified icon. If you also want your Communities to be linked by a recognizable icon, the requirements are easy:
+
+- The icon must be the same as an existing Community avatar.
+- The icon must be safe-for-work, i.e., no suggestive or violent material.
+- Your Communities must take care to [follow our policy](README.md#policy), which includes the Session Terms of Service.
+
+Once you've chosen which of your existing Communities will share an avatar with your whole server, simply [let us know](README.md#contact-us).