Update and rename README.md to README.md

Author: raghavs046

Specialized Areas/Fix scripts/Cacel Struck Slack Conversations/README.md

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+**Use Case**
+1. Sometimes due to network or connecton issue, users are not able to end the conversations using **restart** or **end** command from slack.
+2. This script will cancel the struck slack conversations, allowing the users to interaction with ServiceNow again through slack.
+3. The encoded Qyery device type specify the source of conversation.