Minor Improvements to Docu and MPI Example

1. The root folder's README.md now has a rudimentary entry for
   installing MPICH (which needs to be extended further).

2. We now do "#include <mpi.h>" instead of "#include "mpi.h", which I
   think is better.

Author: Thomas Weise

README.md

@@ -72,14 +72,20 @@ For running some of the [Java Servlets](http://github.com/thomasWeise/distribute
 
 For running the [Web Service](http://github.com/thomasWeise/distributedComputingExamples/tree/master/webServices/) examples, you will need to download [Apache Axis2/Java](http://axis.apache.org/axis2/java/core/) from the corresponding [download page](http://axis.apache.org/axis2/java/core/download.html). I recommend using at least Axis2 1.7.1.
 
-### 2.6. GCC and Libraries
+### 2.6. GCC
 
 In order to compile the examples written in the C programming language (such as the C-based [sockets examples](http://github.com/thomasWeise/distributedComputingExamples/tree/master/sockets/c)), you will need a C compiler such as GCC. Under Linux, it should normally be already installed and can otherwise be installed via `sudo apt-get install gcc`. Under Windows, you will need to install [MinGW](http://mingw.org/), usually via the [web installer](https://sourceforge.net/projects/mingw/files/Installer/mingw-get-setup.exe/download).
 
-#### 2.6.1. Cross-Compiling for Windows under Linux
+### 2.7. Cross-Compiling for Windows under Linux with GCC
 
 Several of the C examples come for Windows or Linux. GCC allows you to cross-compile, i.e., if you are using Linux, you can compile C programs for Windows. For this purpose, you would first install `sudo apt-get install gcc-mingw-w64-i686` and then can use the command `gcc-mingw-w64-i686` in the same way you would use `gcc` under MinGW.
 
+### 2.8. MPICH
+
+In order to build and compile our [examples](http://github.com/thomasWeise/distributedComputingExamples/tree/master/mpi/) for using the Message Passing Interface (MPI), we need an MPI implementation. We choose MPICH.
+
+Under Linux, you can install the required files via `sudo apt-get install mpich libmpich-dev`.
+
 ## 3. Licensing
 
 This work has purely educational purposes. Besides everything mentioned below, for anything in this repository, I impose one additional licensing condition: The code must never be used for anything which might violate the laws of Germany, China, or the USA. This also holds for any other file or resource provided here.

mpi/bareBones.c

@@ -1,4 +1,4 @@
-#include "mpi.h"
+#include <mpi.h>
 
 int main(int argc, char **argv) {
   MPI_Init(&argc, &argv);