Created Disable invitations (markdown)

Disable-invitations.md

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+Even when registration is disabled, organization administrators or owners can invite users to join organization. This won't send email invitation to the users, but after they are invited, they can register with the invited email even if `SIGNUPS_ALLOWED` is actually set to `false`. You can disable this functionality completely by setting `INVITATIONS_ALLOWED` env variable to `false`:
+
+```sh
+docker run -d --name bitwarden \
+  -e SIGNUPS_ALLOWED=false \
+  -e INVITATIONS_ALLOWED=false \
+  -v /bw-data/:/data/ \
+  -p 80:80 \
+  mprasil/bitwarden:latest
+```