Added a new book and video course

_data/books.yml

@@ -1,4 +1,21 @@
 ---
+-   date: '2017-04-28'
+    description: "This book will put you straight to work in creating powerful and unique
+        computer vision applications by diving into important aspects of OpenCV such as facial
+        recognition, image target tracking, making augmented reality applications, the 3D
+        visualization framework, and machine learning."
+    image: Mastering_OpenCV3_Second_Edition.jpg
+    link: https://www.packtpub.com/application-development/mastering-opencv-3-second-edition
+    title: Mastering OpenCV 3 - Second Edition
+    type: book
+-   date: '2017-04-26'
+    description: "This course is for developers who are new to OpenCV and want to develop
+        computer vision applications with OpenCV in C++. A basic knowledge of C++ would be
+        helpful."
+    image: BuildWithOpenCV.jpg
+    link: https://www.packtpub.com/application-development/build-opencv
+    title: Build with OpenCV
+    type: video
 -   date: '2017-01-31'
     description: "This course will help you enhance your understanding of Computer Vision
         and image processing by developing real-world projects in OpenCV 3"