title: Convert unsigned apk into signed apk
body: <p>I have an android application with un-signed package, Whenever I try to install this apk, following error message throws <code>Failure [INSTALL_PARSE_FAILED_NO_CERTIFICATES]</code>.</p>
  
  <p>Now I want to insert my keystore certifcate with this apk file. is there any possibilities to do this with external command rather than IDE?</p>