create a clear and short intro for users to take action to use this repo

[botingw]

Description

find some users on reddit ask for more in-depth intro
my thought: people want to see exactly what the rule files or memory docs look like, and how they really fit into their workflow.

plan

create a 3 minutes read intro, perhaps on medium or reddit post, perhaps in README?

1. key features
2. demo for a simple case
3. very short paragraph intro how it works (memory bank, rules)
4. sample of docs (memory bank, rules)