Adding two basic steganography challenges

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challenges/chapter_1/stega/image_1/image1.md

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+# Image 1
+
+Description: You recieved an image, maybe there is something hidden? There are a lot of tools that allow you to hide stuff in images. This is called steganography. Try to find some tools that could help you analyse this image. 

challenges/chapter_1/stega/image_1/image1_solution.md

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+{flag:st3gh1d3_r0ckz}

challenges/chapter_1/stega/image_2/image2.md

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+# Image 2
+
+Description: Have you already worked with designer tools?