feat

README.md

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+# protoc-gen-markdown
+
+## install
+
+```bash
+go install git.apinb.com/bsm-tools/protoc-gen-markdown
+```
+
+## generate markdown
+
+```bash
+protoc --markdown_out=Mhello.proto=./:. ./hello.proto
+# set path prefix to /api
+protoc --markdown_out=Mhello.proto=./,prefix=/api:. ./hello.proto
+```