Simplify

[DarkTyger]

Consider:

• Write docs on using the plugin (i.e., put gradle gatherLicense somewhere)
• Simplify the plugin to work similar to all the other license gathering plugins.

For the second part, here's how it could work, ideally:

1. Add plugin.

plugins {
  id 'application'
  id 'com.github.vlsi.license-gather' version '1.78'
}

2. Run plugin.

$ gradle gatherLicense

3. View output.

$ cat build/.../licenses.txt