build page in book

docs/src/getting_started/build.md

@@ -1,3 +1,24 @@
 # Build
 
+LibAFL, as most of the Rust projects, can be built using `cargo` from the root directory of the project with:
 
+```sh
+$ cargo build --release
+```
+
+Note that the `--release` flag is optional for development, but it is needed for fuzzing at a decent speed,
+otherwise you will experience a slowdown of even more than 10x.
+
+The LibAFL repository is composed by multiple crates, and the top-level Cargo.toml is just an orchestrator that groups these crates
+in a workspace. Building from the root directory will build all the crates in the workspace.
+
+## Build example fuzzers
+
+You can notice that in the repository there is a `fuzzers/` folder.
+This folder contains a set of crates that are not part of the workspace, so that are not built issuing `cargo build` from the top-level directory.
+
+These crates are examples of fuzzers using particular features of LibAFL combined sometimes with instrumentation backends (e.g. [SanitizerCoverage](https://clang.llvm.org/docs/SanitizerCoverage.html), [Frida](https://frida.re/), ...).
+
+The user can use these crates as examples and as skeleton for its custom fuzzer using a similar set of features.
+
+To build an example fuzzer you have to invoke cargo from its folder (`fuzzers/[FUZZER_NAME]).

docs/src/getting_started/crates.md

@@ -1 +1,13 @@
 # Crates
+
+LibAFL is composed by different crates.
+Each one has its self-contained purpose, and the user may not need to use all of them in its project.
+
+Following the naming convention of the folders in the project's root, they are:
+
+- libafl
+- libafl_derive
+- libafl_targets
+- libafl_cc
+
+

docs/src/getting_started/getting_started.md

@@ -1,4 +1,4 @@
 # Getting Started
 
 To start using LibAFL, there are some first steps to do. In this chapter, we will
-discuss how to install LibAFL with `cargo`, how are structured its crates and the purpose of each crate.
+discuss how to download LibAFL and build with `cargo`, how are structured its crates and the purpose of each crate.