[ matjrix-docker-compose] create README.md for Task#11983

README.md

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+## Usage and Components
+
+Note: as of 2023-09-01 this docker-compose is available internally.
+
+### Versions
+
+* Element: https://hub.docker.com/r/vectorim/element-web/tags
+* Synapse: https://hub.docker.com/r/matrixdotorg/synapse/tags
+
+### Domains / homeserver.yaml and element-config.json
+
+* synapseFQDN: on which domain the home server is reachable
+* elementWebFQDN: on which domain element web will be deployed
+* homeServerFQDN: the "matrix domain" that identifies the users
+
+### Sample usage
+
+Setting up matrix for  ...
+
+- the matrix domain "fn.nf"
+- the homeserver "homeserver.fn.nf"
+- element web on m.fn.nf
+
+- set directory owner
+
+```
+chmod 777 ./synape
+```
+
+
+```
+docker-compose up -d
+```