Initial commit of commit message length validation plugin

Replacing the checks that are removed from core Gerrit in
Ia0858b11e475c48f50ec63fbe0076239edf8f64b

Change-Id: I2b4bec03b0caefdf7c71606e7daa188c24b6c494
4 files changed
tree: bbf28d270ed879784f827023858f591fb2ca5871
  1. src/
  2. .gitignore
  3. LICENSE
  4. pom.xml