add TOTP algorithm scripts.

Time-based-One-Time-Password/README.md

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+## Desc
+
+A time-based one-time password algorithm(TOTP), implemented entirely 100% in Javascript. 
+
+This script complies with [RFC6238](https://datatracker.ietf.org/doc/html/rfc6238) specification and can be run in Surge, QuantumultX, Loon, Shadowrocket.
+
+
+
+## Usage
+
+```javascript
+const key = 'YOURCLIENTTOKEN'; //TOTP key
+const totp = TOTP(key); //Return a six-digit one-time password.
+
+console.log(totp); //Print log
+```
+
+
+
+## Acknowledgements
+
+This script is adapted from https://jsfiddle.net/russau/rbyjk774 and uses Brian Turek's [jsSHA](https://github.com/caligatio/jsSHA/).
+