fixes #507 as assigned to me in #332

packages/sg-webhooks-consumer/.gitignore

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+node_modules
+.env
+npm-debug.log*
+*.log

packages/sg-webhooks-consumer/Procfile

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+web: node index.js
+dev: nodemon index.js --ignore client

packages/sg-webhooks-consumer/README.md

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+## To Start Local Server - 
+ A. Setting Up the server - 
+
+  1. Install heroku-cli
+  2. Install nodemon with `npm i -g nodemon`
+  3. Run `npm i` to install the server-side dependencies
+  4. Run `touch .env` then open it and fill it like the sample .env file.
+  5. Run `npm start` and make sure the mongo instance is also running.
+
+ B. Setting Up the client - 
+
+  1. Run `cd client ` in separate terminal to change into client directory.
+  2. In client directory run `npm i` to install client-side dependencies.
+  3. In client directory run `touch .env` and fill `stripePubKey=pk_test_--------------` in it .
+  4. In client directory run `npm start `.
+  5. Navigate to localhost:3000 in the browser.
+
+
+  Go to https://app.sendgrid.com/settings/mail_settings and enable Event Notification. There pass the callback url as `{hosturl}/api/surveys/webhooks`. Also check that click tracking is enabled.
+
+## Sample .env file
+```
+NODE_ENV=development
+port=5000
+googleClientID=-------------.apps.googleusercontent.com
+googleClientSecret=--------------
+mongoURI=mongodb://localhost:27017/merndemodb
+cookieKey=---------------
+HOST_URL=http://localhost:5000
+stripePubKey=pk_test_--------------
+stripeSecretKey=sk_test_-------------
+```
+
+## Milestones 
+ 1. [x] Configure Express to work with React.js via Proxy.
+ 2. [x] Google Oauth2.0 Api.
+ 3. [x] Stripe payment Api.
+ 4. [x] Setup production build to Heroku.
+ 5. [x] Handle multiple env variables for both server and client.
+ 6. [x] Use ES2017 syntax with async/await instead of promises.
+ 7. [x] React with Redux architecture.
+ 8. [x] Session Authentication with Passport.js and Cookies.
+ 9. [x] Create Webhooks for Google and Stripe Apis.
+ 10. [x] Database Management using MongoDB.
+
+Note - 
+1. Heroku Cli is used for handling **environment variables** and deploys.
+2. To get **googleClientID** and **googleClientSecret** make a new project at [here](https://console.developers.google.com) and enable the Google+ api.
+3. To get **stripePubKey** and **stripeSecretKey** create account on [Stripe](http://stripe.com/).
+4. If you don't have **mongodb** locally, then create a remote db [here](https://mlab.com/home)

packages/sg-webhooks-consumer/client/.gitignore

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+# See https://help.github.com/ignore-files/ for more about ignoring files.
+
+# dependencies
+/node_modules
+
+# testing
+/coverage
+
+# production
+/build
+
+# misc
+.DS_Store
+.env.local
+.env.development.local
+.env.test.local
+.env.production.local
+
+npm-debug.log*
+yarn-debug.log*
+yarn-error.log*