feat

* Created the contributing guide

CONTRIBUTING.md

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+## Description
+This is and PWA, IOS, and andriod (using capacitor) APP, to contribute to the project you need to clone the repository and follow the next steps.
+
+## Content
+
+- [Description](#description)
+- [Content](#content)
+  - [Get started](#get-started)
+- [Frontend](#frontend)
+- [Android](#android)
+- [IOS](#ios)
+  - [API entry point](#api-entry-point)
+- [Frontend production](#frontend-production)
+- [Backend](#backend)
+
+### Get started 
+
+**Requirements:**
+- PHP 7.1.2 o superior
+- Mysql 5.6
+- NodeJs 10
+- NPM 6.4
+- Composer 1.8
+
+---
+
+## Frontend
+
+```bash
+git clone https://github.com/itsalb3rt/sheiley_shop_app.git
+```
+
+```bash
+yarn install 
+```
+
+```bash
+yarn serve
+# or run the next command for production
+yarn build
+```
+
+## Android
+
+To run app in `Android mode`;
+
+```bash
+yarn serve:android
+```
+
+After the command is runny, the android studio will open and you can see the app in the emulator.
+
+![](https://capacitorjs.com/assets/img/docs/android/running.png)
+
+**Build**
+
+```bash
+yarn build:android
+```
+
+Run the following command in the `Android Studio` console, make a sure the terminal is in `src-capacitor/android` dir:
+
+```
+gradlew :app:bundleRelease
+```
+
+Now the **aab** file is on `src-capacitor\android\app\build\outputs\bundle\release`
+
+Sign the **aab** file
+
+```
+jarsigner -verbose -sigalg SHA1withRSA -digestalg SHA1 -keystore ./secret/release-key.keystore ./src-capacitor/android/app/build/outputs/bundle/release/app-release.aab sheiley_shop_app
+```
+
+Enter the **Passpharese** for the keystore:
+
+and now the **aab** file is ready to lunch in the store. :confetti_ball:
+
+## IOS
+
+To run app in `IOS mode`;
+
+```bash
+yarn serve:ios
+```
+
+After the command is runny, the xcode will open and you can see the app in the emulator.
+
+![](https://capacitorjs.com/assets/img/docs/ios/running.png)
+
+**Build**
+
+```bash
+yarn build:ios
+```
+
+Remember in `src-capacitor` all the dependencies need to be installed.
+
+After build is complete and the xcode is open, you need create archive from the app:
+
+- Select the device, Any iOS Device
+
+![](./docs/ios-device-selection.png)
+
+
+- Go to Product -> Archive
+
+![](./docs/ios-create-archive.png)
+
+Now you get a archivo for distribution.
+
+![](./docs/archives.png)
+
+### API entry point
+
+change the API entry pont in `env` file
+
+```env
+VUE_APP_API_DEV=http://localhost/sheiley_shop_api
+VUE_APP_API_PRO=https://example.com/sheiley_shop_api
+```
+
+:tada: This is all you need to test it in your local environment!
+
+## Frontend production
+
+
+If you hosted the app in subdirectory go to `vue.config.js` and set the subdirectory name in `publicPath` property 
+
+---
+
+## Backend
+
+Go to API repository [https://github.com/itsalb3rt/sheiley-shop-api](https://github.com/itsalb3rt/sheiley-shop-api)