Update Readme.md (#159)

- Separate a section for prerequisites.
- Add web server host prerequisite as well as Redis Server installation since the defaults asume the redis cache driver.

readme.md

@@ -4,9 +4,13 @@ This is an open source forum that was built and maintained at Laracasts.com.
 
 ## Installation
 
-### Step 1
+### Prerequisites
+
+* To run this project, you must have PHP 7 installed.
+* You should setup a host on your web server for your local domain. For this you could also configure Laravel Homestead or Valet. 
+* If you want use Redis as your cache driver you need to install the Redis Server. You can either use homebrew on a Mac or compile from source (https://redis.io/topics/quickstart). 
 
-> To run this project, you must have PHP 7 installed as a prerequisite.
+### Step 1
 
 Begin by cloning this repository to your machine, and installing all Composer & NPM dependencies.