slackcat: add page

pages/common/slackcat.md

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+# slackcat
+
+> Utility for passing files and command output to Slack.
+
+- Post a file to Slack:
+
+`slackcat --channel {{channel_name}} {{path/to/file}}`
+
+- Post a file to Slack with a custom filename:
+
+`slackcat --channel {{channel_name}} --filename={{filename}} {{path/to/file}}`
+
+- Pipe command output to Slack as a text snippet:
+
+`{{command}} | slackcat --channel {{channel_name}} --filename={{snippet_name}}`
+
+- Stream command output to Slack continuously:
+
+`{{command}} | slackcat --channel {{channel_name}} --stream`