Add link to logcli doc

Signed-off-by: Xiang Dai <764524258@qq.com>

README.md

@@ -37,6 +37,7 @@ Once you have promtail, Loki, and Grafana running, continue with [our usage docs
 - [API documentation](./docs/api.md) for alternative ways of getting logs into Loki.
 - [Operations](./docs/operations.md) for important aspects of running Loki.
 - [Promtail](./docs/promtail-setup.md) on how to configure the agent that tails your logs.
+- [Logcli](./docs/logcli.md) on how to query your logs without Grafana.
 - [Troubleshooting](./docs/troubleshooting.md) for help around frequent error messages.
 - [Usage](./docs/usage.md) for how to set up a Loki datasource in Grafana and query your logs.