adding a README on using git and eclipse
What Will wrote didn't work and I found a way that works a little better

It's better to install SWT first before making your project. It's better to create an SWT project as opposed to making a Java project.

One of the imports of the file still doesn't get resolved when you follow these steps. I'm figuring it out right now.
Updated using_git.md

This update reflects the fact that I think I solved the org.eclipse.wb.swt.SWTResourceManager issue.
Merge pull request #1 from williamhc/adding-starter-docs

adding a README on using git and eclipse