add readme

Author: katzy687

cloudshell-cli-samples/send_ssh_command/readme.MD

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+# Resource Script - Linux Send SSH Command
+Uses cloudshell-cli (paramiko wrapper) to send an ssh command to a linux server.
+
+## Usage
+1. Zip up files and import script
+2. Associate with target model
+3. Create the "command" param
+4. Reserve and test with "ls"
+