update readme

Author: be99inner

README.md

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+Role Name
+=========
+
+Ansible role for provision a Redis exporter for Prometheus.
+
+Requirements
+------------
+
+Ansible version >= 2.9
+
+Role Variables
+--------------
+
+```yaml
+redis_exporter_version: 1.3.5
+redis_exporter_binary_local_dir: ""
+redis_exporter_web_listen_address: "0.0.0.0:9121"
+redis_exporter_web_telemetry_path: "/metrics"
+
+redis_exporter_system_group: "redis-exp"
+redis_exporter_system_user: "{{ redis_exporter_system_group }}"
+
+redis_exporter_redis_address: "redis://localhost:6379"
+redis_exporter_redis_password: ""
+redis_exporter_redis_namespace: "redis"
+
+redis_exporter_custom_option: "-redis-only-metrics"
+```
+
+Dependencies
+------------
+
+None
+
+Example Playbook
+----------------
+
+```yaml
+- hosts: servers
+  gather_facts: true
+  roles:
+      - be99inner.redis-exporter
+```
+
+License
+-------
+
+MIT
+
+Author Information
+------------------
+
+be99inner