update readme

README.md

@@ -5,20 +5,25 @@ gpm - Go Package Manager
 
 gpm(Go Package Manager) is a Go package manage tool for search, install, update and share packages in Go.
 
+#Main commands
+
+- `build` compiles and installs packages and dependencies: basically, it calls `go install` and moves executable to current path from `GOPATH` if any, the executable name is the folder name which is default by `go install`.
+- `install` downloads and installs packages and dependencies: you can download packages without version control tools like git, hg, svn, etc. It downloads and installs all packages including all dependencies automatically(except when you use bundle or snapshot id). For now, this command supports `code.google.com`, `github.com`, `launchpad.net`, `bitbucket.org`. 
+
 ## Todo
 
-- Command `install` add support for downloading code from git.oschina.net, gitcafe.com, *.codeplex.com;
+- Save node information after downloaded, and check for next time, reduce download times.
+- All errors should have specific title for exactly where were created.
+- Add i18n support for all strings.
+- Add gpm working principle design.
 - Add support for downloading tarballs from user sources.
 - After downloaded all packages in bundles or snapshots, need to check if all dependencies have been downloaded as well.
 - Develop user source API server template application to support user sources in bundles.
 - Add bundle and snapshot parser code for downloading by bundle or snapshot id.
 - Add user system to create, edit, upload, and download bundles or snapshots through gpm client program.
-- Add gpm working principle design.
 - Download package from code.google.com only support hg as version control system, probably support git and svn.
-- All errors should have specific title for exactly where were created.
-- Add i18n support for all strings.
 - Add feature for downloading through version control tools, and use `checkout` to switch to specific revision; this feature only be enabled when users use bundle or snapshot id.
-- Add support for downloading by tag for packages in github.com, bitbucket.org.
+- Add support for downloading by tag for packages in github.com, bitbucket.org, git.oschina.net, gitcafe.com.
 - Get author commit time and save in node.
-- Save node information after downloaded, and check for next time, reduce download times.
-- Collect download and installation results and report to users in the end.
+- Collect download and installation results and report to users in the end.
+- Command `install` add support for downloading code from git.oschina.net, gitcafe.com, *.codeplex.com;