readme and ca handling

readme.md

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+# Reviewboard in a container
+
+* Create a database and a database user on a MariaDB/MySQL server, grant all privileges on all tables of that database to that user
+* If you want to inject custom CA certificates for repository access, create a volume, put these certificates (use the extension .ext) into and mount it to `/usr/local/share/ca-certificates/` of the container when starting it.
+* Start the container with something like
+
+``
+docker run \
+  -d \
+  --rm \
+  --name reviews \
+  -p 8080:80 \
+  -e DBHOST=10.8.10.5 \
+  -e DBNAME=reviewboard \
+  -e DBUSER=reviewboard \
+  -e DBPASS=test123 \
+  -e ADMINPASS=test123 \
+  -v RB_CERTS:/usr/local/share/ca-certificates/ \
+  reviews
+``
+
+
+