Update the document by adding information on how to install Geth and Lighthouse. (#568)

* Update the document by adding information on how to install Geth and Lighthouse.

* Include links to the installation pages for Geth and Lighthouse in the document.

* Change the link to the installation documentation to point to the Geth installation documentation at this link: https://geth.ethereum.org/docs/install-and-build/installing-geth.

Co-authored-by: Satoshi Okamoto <satoshi@butcher73.com>

README.md

@@ -41,6 +41,8 @@ The project is not ready for use. We hope to have full sync implemented sometime
 
 Rust minimum required version to build this project is 1.65.0 published 02.11.2022
 
+To test Reth, you will need to have [Geth  installed.](https://geth.ethereum.org/docs/install-and-build/installing-geth)
+
 ```sh
 git clone https://github.com/paradigmxyz/reth
 cd reth

book/installation.md

@@ -1,7 +1,6 @@
 ## Installation
 
-(still WIP, please contribute!):
-
+To use Reth, you must first install Geth. You can find instructions for installing Geth at the following link: https://geth.ethereum.org/docs/install-and-build/installing-geth.
 
 ### Ubuntu
 Building the source
@@ -12,8 +11,8 @@ curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh
 ```
 
 * install Requirements
-- libclang-dev
-- pkg-config
+ - libclang-dev
+ - pkg-config
 
 ```bash
 apt install libclang-dev pkg-config
@@ -60,9 +59,3 @@ cargo build --all
 ```bash
 curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh && brew install llvm pkg-config && git clone https://github.com/paradigmxyz/reth && cd reth && cargo build --all && ./target/debug/reth
 ```
-
-
-
-### Docker
--
--