[S] Change in osmo-sip-connector[master]: doc: Expand the virtually empty user manual with some basics

Attention is currently required from: laforge. fixeria has posted comments on this change. ( https://gerrit.osmocom.org/c/osmo-sip-connector/+/32002 ) Change subject: doc: Expand the virtually empty user manual with some basics ...................................................................... Patch Set 1: Code-Review+1 -- To view, visit https://gerrit.osmocom.org/c/osmo-sip-connector/+/32002 To unsubscribe, or for help writing mail filters, visit https://gerrit.osmocom.org/settings Gerrit-Project: osmo-sip-connector Gerrit-Branch: master Gerrit-Change-Id: Id42904a183b045eefac15a94139221a3bc65ecdd Gerrit-Change-Number: 32002 Gerrit-PatchSet: 1 Gerrit-Owner: laforge <laforge(a)osmocom.org> Gerrit-Reviewer: Jenkins Builder Gerrit-Reviewer: fixeria <vyanitskiy(a)sysmocom.de> Gerrit-Attention: laforge <laforge(a)osmocom.org> Gerrit-Comment-Date: Tue, 21 Mar 2023 22:14:00 +0000 Gerrit-HasComments: No Gerrit-Has-Labels: Yes Gerrit-MessageType: comment