add readme

README.md

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+# Google Backup
+
+This module automatically downloads your Google Mail, Contacts & Calendar to separate files. It'll sync only new Mails, Contacts & Events.
+
+This tool will output the following directory structue:
+
+```
+.
+├── contacts/
+│   └── *.vcf
+├── calendar/
+│   └── *.ical
+└── mail/
+    ├── received/
+    │   └── *.eml
+    └── sent/
+        └── *.eml
+```
+
+## Why?
+
+Google makes great services, but there are many horror stories of people locked out of their accounts. So be safe, and keep your data backed up!
+
+## Usage
+
+### 1. Create a Google App Password
+
+Create a Google App Password at [https://myaccount.google.com/apppasswords](https://myaccount.google.com/apppasswords).
+
+### 2. Run
+
+```bash
+$ npx -y google-backup --username "[email protected]" --password "abcd efgh ijkl mnop" --filepath "~/Backups/Google/"
+```
+
+> Hint: You can schedule this in a cronjob for automated backups.