Add jest and puppeteer for testing

readme.md

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+# Gabinete Digital
+
+## Requirements
+
+[node >= 14](https://nodejs.org/dist/v14.17.3/node-v14.17.3-x64.msi)
+
+## Installation
+
+Use the package manager npm to install dependencies.
+
+```bash
+npm ci
+npm install
+npm install -g @ionic/cli
+npm install -g http-server
+```
+
+## Start the development server
+
+```bash
+ionic serve
+```
+
+
+## build for production and launch server
+
+```bash
+ionic serve build --prod
+npm run start
+```
+
+## Run test
+
+```bash
+npm run jest
+```
+
+
+## Contributing
+For major changes, please open an issue first to discuss what you would like to change.
+
+Please make sure to update tests as appropriate.