pkg.json: test with NPM's package.json parser

Author: justinmk

Diff for: test-npm/.gitignore

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+node_modules/

Diff for: test-npm/README.md

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+# Test pkg.json against NPM's read-package-json library
+
+`pkg.json` tries to be a subset of NPM's `package.json` format. The tests in
+this directory test `pkg.json` samples using NPM's `read-package-json` library.
+
+To run the tests:
+
+    cd test-npm/
+    npm ci
+    npm run test