feat(plugin): add file upload core plugin

plugins/file-upload-core/.amplicationrc.json

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+{
+  "settings": {}
+}

plugins/file-upload-core/.eslintrc.json

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+{
+  "extends": ["../../.eslintrc.json"],
+  "ignorePatterns": ["!**/*"]
+}

plugins/file-upload-core/.gitignore

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+# Mac/OSX
+.DS_Store
+
+# Private Files
+*.csv
+*.csv.gz
+*.tsv
+*.tsv.gz
+*.xlsx
+
+# Build Files
+dist/
+
+# Private Node Modules
+node_modules/
+creds.js
+
+# VSCode
+.vscode/*
+!.vscode/settings.json
+!.vscode/tasks.json
+!.vscode/launch.json
+!.vscode/extensions.json
+*.code-workspace
+
+# Local History for Visual Studio Code
+.history/
+
+# Common credential files
+**/credentials.json
+**/client_secrets.json
+**/client_secret.json
+*creds*
+*.dat
+*password*
+*.httr-oauth*

plugins/file-upload-core/.npmignore

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+.prettierignore
+.gitignore

plugins/file-upload-core/.prettierignore

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+dist

plugins/file-upload-core/README.md

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+# @amplication/plugin-file-upload-core
+
+[![NPM Downloads](https://img.shields.io/npm/dt/@amplication/plugin-file-upload-core)](https://www.npmjs.com/package/@amplication/plugin-file-upload-core)
+
+A short description of the plugin and its actions.
+
+## Purpose
+
+What is the purpose of this plugin and what exactly does it do.
+
+## Configuration
+
+If a configuration is required, add it here.
+
+## Scripts
+
+### `build`
+
+Running `npm run build` will bundle your plugin with Webpack for production.
+
+### `dev`
+
+Running `npm run dev` will watch your plugin's source code and automatically bundle it with every change.
+
+## Usage
+
+Explain the usage of this plugin and its effect on the final build.