Added readme file

README.md

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+# andotp-converter
+
+Sadly andOTP is not maintained anymore. While there are 2FA apps like https://getaegis.app/ which allow
+importing TOTP secrets from andOTP I wanted to migrate to [2FAS](https://2fas.com/). Since 2FAS can't 
+import andOTP data and I didn't want to take a detour over Aegis I created a small toool which
+can convert andOTP exports into 2FAS backup files.
+For my case it worked sufficiently well.
+
+## Usage
+
+`andotp-converter <path-to-andotp-export> <where-the-2fas-file-should-be-created>` That's it.
+Please note that you need to use an unecrypted andOTP export and this tool creates an unecrypted
+2FAS backup file.