Add documentation for ProjectGenerator

[snozawa]

ProjectGeneratorのdocumnetationを追加しました。
よろしくお願いいたします。

[k-okada]

Test FAILed.
Refer to this link for build results: http://jenkins.jsk.imi.i.u-tokyo.ac.jp:8080job/hrpsys-qnx/1659/

Build Log
last 10 lines

[...truncated 36 lines...]
    at hudson.plugins.git.GitSCM.checkout(GitSCM.java:882)
    at hudson.model.AbstractProject.checkout(AbstractProject.java:1253)
    at hudson.model.AbstractBuild$AbstractBuildExecution.defaultCheckout(AbstractBuild.java:622)
    at jenkins.scm.SCMCheckoutStrategy.checkout(SCMCheckoutStrategy.java:86)
    at hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.java:528)
    at hudson.model.Run.execute(Run.java:1745)
    at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:43)
    at hudson.model.ResourceController.execute(ResourceController.java:89)
    at hudson.model.Executor.run(Executor.java:240)