Add README for smart_eval

Author: janine9vn

bot/exts/smart_eval/README.md

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+## Well hello there...
+I see you've come to see how we've managed an intelligence as incredible as Sir Robin's Smart Eval command!
+
+Well the answer is a return to basics, specifically going back to the roots of [ELIZA](https://en.wikipedia.org/wiki/ELIZA).
+
+We welcome others to contribute to the intelligence of the `&smarte` command. If you have more responses or situations you want to capture
+then feel free to contribute new regex rules or responses to existing regex rules. You're also welcome to expand on the
+existing capability of how `&smarte` works or our `&donate` command.