feat(README): Add Create TLS secret from cert and key

Author: ondrejsika

README.md

@@ -1889,6 +1889,25 @@ See: <http://127.0.0.1:8001/api/v1/namespaces/default/pods/cephfs-volume-example
 kubectl apply -f 11_secret.yml
 ```
 
+### Create TLS secret from cert and key
+
+Create secret file `tls_secret_127-0-0-1.uk.local.yaml`
+
+```
+kubectl create secret tls sikademo.com-tls \
+  --key=/sikademo.com.key \
+  --cert=sikademo.com.crt \
+  --dry-run=client -o yaml | tee secret_tls_sikademo_com.local.yml
+```
+
+Create secret in Kubernetes cluster
+
+```
+kubectl create secret tls sikademo.com-tls \
+  --key=/sikademo.com.key \
+  --cert=sikademo.com.crt
+```
+
 ### Get Values
 
 Using **slu**