feat: gen markdown docs for command

docs/cmd/httpboomer.md

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+## httpboomer
+
+One-stop solution for HTTP(S) testing.
+
+### Synopsis
+
+HttpBoomer is the next generation for HttpRunner. Enjoy! ✨ 🚀 ✨
+
+License: Apache-2.0
+Github: https://github.com/httprunner/httpboomer
+Copyright 2021 debugtalk
+
+### Options
+
+```
+  -h, --help   help for httpboomer
+```
+
+### SEE ALSO
+
+* [httpboomer boom](httpboomer_boom.md)	 - run load test with boomer
+* [httpboomer har2case](httpboomer_har2case.md)	 - Convert HAR to json/yaml testcase files
+* [httpboomer run](httpboomer_run.md)	 - run API test
+
+###### Auto generated by spf13/cobra on 11-Oct-2021