Added docs to create port-forward access to redis CLI (#352)

* Added docs to create port-forward access to redis CLI

* nitpicks

* nitpicks

content/for-developers/how-to-guides/connect-to-redis-cli/connect-to-redis-cli.md

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+# Access Redis CLI via Port Forward
+
+This documentation will help to connect to managed Redis via `redis-cli` using port forward.
+
+## CLI Setup
+
+The first step is to setup `redis-cli` on your local machine. For this, go through following steps. If you already have CLI setup, you can skip this section.
+
+- Run following command in terminal
+
+  ```shell
+  sudo apt install redis-tools
+  ```
+
+- Run following command to verify CLI installation.
+
+  ```shell
+  redis-cli --version
+  ```
+
+## Create Port Forwarding to Redis Service
+
+Before running `redis-cli` command we need to port forward to Redis service running in cluster. To achieve this, perform following steps:
+
+- In OpenShift console, click on your username on top right corner and click `Copy login command` as shown below:
+  ![`OpenShift Console`](../images/openshift-console.png)
+- Click on `Display Token` and then copy `oc login` command.
+- Run this command inside your terminal. Now you have access to interact with your cluster using terminal.
+- Run following command to locate service to which we need to create port forward.
+
+  ```shell
+  oc get svc -n <redis-namespace>  
+  ```
+
+  Here `<redis-namespace>` is the name of namespace where Redis is deployed (In current case its value is `bitnami-redis`). This name might be different for you. You can ask about this to cluster admin.
+- You'll get an output similar to one shown below:
+  ![`Redis Services`](../images/redis-services.png)
+- Run the following command to create port forward.
+
+  ```shell
+  oc port-forward svc/<service-name> <port> -n <redis-namespace>
+  ```
+
+    - `<service-name>` is the name of service that has `CLUSTER-IP` assigned. In current case its value is `bitnami-redis`.
+    - `<port>` is the port number for this service to which we need to create port forward. For sentinel mode we need to port forward to port `26379` otherwise to `6379`.
+- This should result in following output:
+  ![`Redis Port Forward`](../images/redis-port-forward.png)
+- At this moment, you need to open a second terminal (while keeping this running) and run following command:
+
+  ```shell
+  redis-cli -h 127.0.0.1 -p <port> -a <password>
+  ```
+
+    - Here `<password>` should be replaced by password used to connect to Redis. This password can easily be retrieved from Vault.
+- At this moment, you should have access to `redis-cli`. As shown below by doing a simple operation on Redis.
+![`Redis CLI`](../images/redis-cli.png)