Update README.md

added fortran note.

README.md

@@ -18,6 +18,9 @@ Self-Driving Car Engineer Nanodegree Program
 * [uWebSockets](https://github.com/uWebSockets/uWebSockets) == 0.14, but the master branch will probably work just fine
   * Follow the instructions in the [uWebSockets README](https://github.com/uWebSockets/uWebSockets/blob/master/README.md) to get setup for your platform. You can download the zip of the appropriate version from the [releases page](https://github.com/uWebSockets/uWebSockets/releases). Here's a link to the [v0.14 zip](https://github.com/uWebSockets/uWebSockets/archive/v0.14.0.zip).
   * If you have MacOS and have [Homebrew](https://brew.sh/) installed you can just run the ./install-mac.sh script to install this.
+* Fortran Compiler
+  * Mac: `brew install gcc` (might not be required)
+  * Linux: `sudo apt-get install gfortran`. Additionall you have also have to install gcc and g++, `sudo apt-get install gcc g++`. Look in [this Dockerfile](https://github.com/udacity/CarND-MPC-Quizzes/blob/master/Dockerfile) for more info.
 * [Ipopt](https://projects.coin-or.org/Ipopt)
   * Mac: `brew install ipopt`
   * Linux