Create usage.md

usage.md

@@ -0,0 +1,27 @@
+gopm
+====
+
+gopm(Go Package Manager) is a Go package manage tool for search, install, update, share packages in Go.
+
+usage:
+
+gopm help        show this document
+gopm sources     list all package source servers or add or rm a source
+gopm list        list all packages local or list all versions of a package
+gopm get         get a package or according to a gopmfile
+gopm upgrade     upgrade a package or all packages and gopm self
+gopm rm          remove a package
+gopm search      search a package according keywords
+gopm doc         show a package's document on console or web browser
+gopm serve       run as a package source server
+gopm sync        sync all packages from first avilable source server to local
+gopm build       build project according to gopmfile
+gopm run         build project according to gopmfile and run
+gopm import      import a package into local
+gopm gen         generate a .gopmspec file according current dir's source codes
+
+
+.gopmspec file format:
+
+beego = tag:0.1
+xorm >= branch:0.2