chore: starter tests for plugin hooks

.eslintignore

@@ -1 +1,2 @@
 node_modules
+test

.github/workflows/test.yml

@@ -32,3 +32,5 @@ jobs:
       - name: Linting
         run: npm run format:ci
         if: "${{ matrix.node-version == '*' }}"
+      - name: Run tests
+        run: npm run test

.prettierignore

@@ -14,3 +14,6 @@ node_modules
 
 # Optional REPL history
 .node_repl_history
+
+# Tests
+test

README.md

@@ -31,9 +31,9 @@ Create a `netlify.toml` in the root of your project. Your file should include th
 If you'd like to install this plugin at a fixed version, install it via your package manager:
 
 ```bash
-npm install @netlify/plugin-angular-universal
+npm install -D @netlify/plugin-angular-universal
 # or
-yarn add @netlify/plugin-angular-universal
+yarn add -D @netlify/plugin-angular-universal
 ```
 
 Read more about [file-based plugin installation](https://docs.netlify.com/configure-builds/build-plugins/#file-based-installation)
@@ -43,7 +43,7 @@ in our docs.
 
 ### Plugin Side Effects
 
-This plugin will make direct changes to your project source when run via the CLI:
+When this plugin is run as part of the build process using the Netlify CLI, direct changes will be made to your project source:
 
 1. It will modify your angular.json to add a `serverless` project configuration.
 2. It will add `serverless.ts` and `tsconfig.serverless.json` files.