chore: Create .env.example

.env.example

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+# Frontend config ************************************************************************************************************************************************************************************************
+# Set CI to false while running the app locally
+CI=false
+# Set it to the URL form where the app home page will be accessed
+PUBLIC_URL=https://app.opensignlabs.com/
+# Set it to true if you want to generate the Sourcemap for debugging
+GENERATE_SOURCEMAP=false
+# Set it to the URL from where APIs will be accessible, for local development it should be localhost:3000/api/app (use your local port number instead)
+REACT_APP_SERVERURL=https://app.opensignlabs.com/api/app
+# A 12 character long random app identifier. The value of this should be same as APP_ID which is a variable used by backend API.
+REACT_APP_APPID=aDsADsqweqwe
+# Google tag manager container id for configuring GTM on all pages of the app
+REACT_APP_GTM=GTM-123N7LD
+
+# Backend ExpressJS config ****************************************************************************************************************************************************************************************
+# A 12 character long random app identifier. The value of this should be same as REACT_APP_APPID which is a variable used by Frontend React App.
+APP_ID=aDsADsqweqwe
+# Name of the app. It will be visible in the verification emails sent out.
+appName=open_sign_server
+# A 12 character long random secret key that allows access to all the data. It is used in Parse dashboard config to view all the data in the database. 
+MASTER_KEY=XnAadwKxxByMr
+# Mongodb URI to connect to
+MONGODB_URI=mongodb://username:password@localhost:27017
+# Path on which APIs should be mounted. Do not change this. This variable shall be removed & value hardcoded in the source code in coming versions.
+PARSE_MOUNT=/app
+# Set it to the URL from where APIs will be accessible to the NodeJS functions, for local development it should be localhost:3000/api/app (use your local port number instead)
+SERVER_URL=https://app.opensignlabs.com/api/app
+
+# Storage config ************************************************************************************************************************************************************************************************
+# Digital ocean space name or AWS S3 bucket name for uploading documents
+DO_SPACE=DOSPACENAME
+# Digital ocean spaces endpoint or AWS S3 endpoint for uploading documents
+DO_ENDPOINT=ams3.digitaloceanspaces.com
+# Digital ocean baseurl or AWS S3 base URL
+DO_BASEURL=https://DOSPACENAME.ams3.digitaloceanspaces.com
+# Digital ocean spaces access key ID or AWS s3 Access key ID for uploading the docs
+DO_ACCESS_KEY_ID=
+# Digital ocean spaces secret access key or AWS s3 secret access key for uploading the docs
+DO_SECRET_ACCESS_KEY=
+# Digital ocean spaces region or AWS s3 region
+DO_REGION=us-west
+
+# Email mailgun config (The app will not initialize if any of these 3 variables are not set) *********************************************************************************************************************
+MAILGUN_API_KEY=
+MAILGUN_DOMAIN=mail.yourdomain.com
+MAILGUN_SENDER=postmaster@mail.yourdomain.com
+
+# Base64 encoded PFX or p12 document signing certificate file *********************************************************************************************************************
+PFX_BASE64=