sample: add sample app

Author: utkace

example/sample-app/.editorconfig

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+# http://editorconfig.org
+# same as vue.js
+root = true
+
+[*]
+charset = utf-8
+end_of_line = lf
+indent_size = 2
+indent_style = space
+insert_final_newline = true
+max_line_length = 80
+trim_trailing_whitespace = true
+
+[*.md]
+max_line_length = 0
+trim_trailing_whitespace = false
+
+[COMMIT_EDITMSG]
+max_line_length = 0

example/sample-app/.gitignore

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+.DS_Store
+node_modules
+/dist
+
+# local env files
+.env
+.env.local
+.env.*.local
+
+# Log files
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*
+
+# Editor directories and files
+.idea
+.vscode
+*.suo
+*.ntvs*
+*.njsproj
+*.sln
+*.sw?

example/sample-app/README.md

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+This project was bootstrapped with [Create React App](https://github.com/facebook/create-react-app).
+
+## Installation
+
+Run the following commands from your shell.
+
+### Getting the SDK ready
+
+We will first go to the root,
+
+```js
+cd ../../
+```
+
+Install the node modules,
+```js
+npm install
+```
+
+Create the dist:
+
+```js
+npm run build
+```
+
+Now link it with, npm link
+
+```js
+npm link
+```
+This will create a global repository link for imagekit-vue
+
+### Installing the sample-app
+
+Now, Go to `sample-app` by,
+```js
+cd example/sample-app
+```
+
+then,
+```
+npm install
+```
+
+Now run,
+```
+npm link imagekit-vue
+```
+This should create a copy of `imagekit-vue` library in `node_modules` of `sample-app`
+
+## Setting the environment variable
+Create a .env file by renaming the sample.env in examples/sample-app
+
+Fill is the required parameters according to your imagekit account.
+
+## Starting the app
+Finally run the app,
+```
+npm run serve
+```
+
+
+To run the upload component you also will have set up a server
+
+## Setting up the server
+There is a sample server present in the sample app directory in server directory. To run this server, go to server directory,
+
+```cd server```, then run
+
+```js
+npm install
+
+npm run server
+```
+It takes the `private key` from .env file, so create a .env file by renaming the sample.env in `examples/sample-app/server`

example/sample-app/babel.config.js

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+module.exports = {
+  presets: [
+    '@vue/cli-plugin-babel/preset'
+  ]
+}