Updated Readme with usage examples.

README.md

@@ -5,9 +5,32 @@ Interchangeable backends:
 - OpenCL
 - OpenACC
 
+
 ## Project Health
 
 | Service | System | Compiler | Status |
 | ------- | ------ | -------- | -----: |
 |  [Travis-CI](https://travis-ci.org/Trick-17/backends) | Ubuntu 14.04<br>OSX | GCC 6<br>Clang | [![Build Status](https://travis-ci.org/Trick-17/backends.svg?branch=master)](https://travis-ci.org/Trick-17/backends) |
-|  [AppVeyor](https://ci.appveyor.com/project/Trick-17/backends) | Windows | MSVC12 <br/> MSVC14 <br/> MSVC14.1 | [![Build status](https://ci.appveyor.com/api/projects/status/k7d43bdnl80kwuq2?svg=true)](https://ci.appveyor.com/project/Trick-17/backends) |
+|  [AppVeyor](https://ci.appveyor.com/project/Trick-17/backends) | Windows | MSVC12 <br/> MSVC14 <br/> MSVC14.1 | [![Build status](https://ci.appveyor.com/api/projects/status/k7d43bdnl80kwuq2?svg=true)](https://ci.appveyor.com/project/Trick-17/backends) |
+
+
+## Including this library in your code
+
+TODO...
+
+
+## Library usage
+
+Filling a vector with a single value:
+```C++
+auto myVec = backends::vector<double>(2000);
+backends::fill(myVec, 12.0);
+```
+
+Typical reductions:
+```C++
+auto myVec = backends::vector<double>{1, 2, 3, 4};
+double sum  = backends::sum(myVec);
+double mean = backends::mean(myVec);
+// The sum should be 12, the mean should be 2.5
+```