updating tools readme files

examples/depth_eval_tools/collect/README.md

@@ -42,4 +42,6 @@
 	K4A_FRAMES_PER_SECOND_15,  1: FPS=15.
 	K4A_FRAMES_PER_SECOND_30,  2: FPS=30.
 
-## Dependencies 
+## Dependencies 
+
+	OpenCV

examples/depth_eval_tools/depth_eval/README.md

@@ -21,4 +21,7 @@
     Example:
 		```./depth_eval -i=board1.mkv -d=board2.mkv -t=plane.json -out=c:/data```
 
-## Dependencies 
+## Dependencies 
+
+	OpenCV
+	OpenCV Contrib

examples/depth_eval_tools/mkv2images/README.md

@@ -17,4 +17,7 @@
     Example:
 		```./mkv2images -in=board1.mkv -out=c:/data -c=0 -f=0```
 
-## Dependencies 
+## Dependencies 
+
+	OpenCV
+	OpenCV Contrib

examples/depth_eval_tools/transformation_eval/README.md

@@ -20,4 +20,7 @@
     Example:
 		```./transformation_eval -i=board1.mkv -d=board2.mkv -t=plane.json -out=c:/data```
 
-## Dependencies 
+## Dependencies 
+
+	OpenCV
+	OpenCV Contrib