add secure tunnel slack integration script

[snail-gggg]

I have deleted the original repository and cannot recover it of this PR #76, so need to create a new PR to fix this issues.

@snail-gggg
Line 16, suggest change "the target Openshift cluster Log in string, It used to create the Application mapping(port-forwarding) of the IBM Cloud Pak for Watson AIOps instance URL." to "the target OpenShift cluster log in string. It is used to create the Application mapping(port-forwarding) of the IBM Cloud Pak for Watson AIOps instance URL."
Line 21, suggest change "if your AIOps cluster in a airgap environment and it cannot access the public network in the cluster," to "if your AIOps cluster is in a airgap environment and it cannot access the public network in the cluster,"
Line 23, suggest change "use" to "by using"
Line 149， suggest change "loged" to "logged"
Line 188, change "found" to "find"
Line 350, suggest change "the namespace ${PORT_FORWARDING_NAMESPACE} in the target openshift cluster not exist, will create it" to "the namespace ${PORT_FORWARDING_NAMESPACE} in the target OpenShift cluster does not exist, will create it"
Line 365, suggest change "the docker image pull secret: ${PULL_SECRET_NAME} is exist, will delete and re-create it." to "the docker image pull secret: ${PULL_SECRET_NAME} already exists, will delete and re-create it."