feat(docs): add get started

Signed-off-by: Alex Chi <iskyzh@gmail.com>

mini-lsm-book/src/00-get-started.md

@@ -0,0 +1,27 @@
+# Get Started
+
+The starter code and reference solution is available at [https://github.com/skyzh/mini-lsm](https://github.com/skyzh/mini-lsm).
+
+## Install Rust
+
+See [https://rustup.rs](https://rustup.rs) for more information.
+
+## Clone the repo
+
+```
+git clone https://github.com/skyzh/mini-lsm
+```
+
+## Starter code
+
+```
+cd mini-lsm/mini-lsm-starter
+code .
+```
+
+## Run tests
+
+```
+cargo x copy-test day1
+cargo x scheck
+```