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/package.json b/package.json
new file mode 100644
index 0000000..a11a1ed
--- /dev/null
+++ b/package.json
@@ -0,0 +1,9 @@
+{
+  "private": true,
+  "scripts": {
+    "postinstall": "husky install"
+  },
+  "devDependencies": {
+    "husky": "^5.0.4"
+  }
+}