build(hooks): add Husky configuration

Husky is a tool for managing Git hooks within the repository itself.
Traditionally, commit hooks need to be manually installed on a per-user
basis, but Husky allows us to install these hooks either automatically
when `npm install` is invoked within the repository, or manually with
`npx husky install`.

This will become useful for us in the next few patches when we begin
introducing tools for enforcing a commit message style.

Change-Id: I64cae147e9ea910347416cfe0bcc4652ec9b4830
Signed-off-by: Chris Kay <chris.kay@arm.com>
diff --git a/.gitignore b/.gitignore
index 79c5104..f524658 100644
--- a/.gitignore
+++ b/.gitignore
@@ -42,3 +42,5 @@
 # Ctags
 tags
 
+# Node.js
+node_modules/