add a picture to github readme code example

Example 1: add image to readme

![alt text](http://url/to/img.png)

Example 2: adding a preview image in readme.md

// method 1


// method 2
![Test Image 3](/3DTest.png)
![Test Image 4](https://github.com/tograh/testrepository/3DTest.png 112)

// last method

Example 3: README.md image

If you want to embed images, this is how you do it:

![Image of Yaktocat](https://octodex.github.com/images/yaktocat.png)

Example 4: add image to readme

![alt text](https://github.com/[username]/[reponame]/blob/[branch]/image.jpg?raw=true)

Example 5: github adding images to readme

![alt text](http://url/to/img.png)