Add an Issue template for new issues

Since we've got a new feature here on github i would like to use it to get all relevant information into the reported issues.
https://help.github.com/articles/creating-an-issue-template-for-your-repository/

I started a file but i would like to hear some other options about what to add.

add "steps to reproduce" if no code example is applicable

change to comments from alalek

ISSUE_TEMPLATE.md

@@ -0,0 +1,34 @@
+This is a template helping you to create an issue which can be processes as quickly as possible. Feel free to add additional information or remove not relevant points if you do not need them.
+### Please state the information for your system
+- OpenCV version: 2.4 / 3.x
+- Host OS: Linux (Ubuntu 14.04)  / Mac OS X 10.11.3 / Windows 10
+- *(if needed, only cross-platform builds)* Target OS: host / Android 6.0 / ARM board / Raspberry Pi 2
+- *(if needed)* Compiler & CMake: GCC 5.3 & CMake 3.5
+
+### In which part of the OpenCV library you got the issue?
+Examples:
+- objdetect, highgui, imgproc, cuda, tests
+- face recognition, resizing an image, reading an jpg image
+
+### Expected behaviour
+
+### Actual behaviour
+
+### Additional description
+
+### Code example to reproduce the issue / Steps to reproduce the issue
+Please try to give a full example which will compile as is.
+```
+#include "opencv2/core.hpp"
+#include <iostream>
+using namespace std;
+using namespace cv;
+
+int main()
+{
+    double d[] = { 546,2435,7,4534,23423,3 };
+    cout << "d = 0x" << reinterpret_cast<void*>(d) << endl;
+
+    return 0;
+}
+```