Update readme with ninja build

diff --git a/README.md b/README.md
index ffcae0b048383c4e8b89b860389924e7225a8bbd..27861747db936a56feb2d85f0f8f8fb19a2a4cb3 100644 (file)
--- a/README.md
+++ b/README.md
@@ -15,6 +15,14 @@ cmake ../
 make
 ```
 
+To build with ninja:
+```
+mkdir build
+cd build
+cmake -DCMAKE_BUILD_TYPE=Release -G Ninja ../
+ninja -v
+```
+
 # RRT Extensions
 There is basic RRT\* algorithm in `rrts.cc` file. To test different approaches
 and upgrades to RRT, *extensions* are declared in `rrtext.h` and implemented in