Starting the book.

candle-book/src/guide/installation.md

@@ -1 +1,24 @@
 # Installation
+
+Start by creating a new app:
+
+```bash
+cargo new myapp
+cd myapp
+cargo add --git https://github.com/LaurentMazare/candle.git candle
+```
+
+At this point, candle will be built **without** CUDA support.
+To get CUDA support use the feature `cuda`
+```bash
+cargo add --git https://github.com/LaurentMazare/candle.git candle --features cuda
+```
+
+You can check everything works properly:
+
+```bash
+cargo build
+```
+
+
+You can also see feature `mkl` which could be interesting to get faster inference on CPU. [Using mkl](./advanced/mkl.md)