Update README.md

Added features and images of single clasp box.

README.md

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 # penguin_case
 3D printed, parametric, waterproof latching box
+
+## Awesome Features
+
+* Holds things
+* Has any number of clasps or hinges as long as it's an integer between 0 and 2 noninclusive
+* Compatible with hinges and clasps from: https://www.thingiverse.com/thing:4094861
+
+## Eventual Features
+
+* More customizable (2 hinges on left and right side of box!)
+* Penguin clasp design (ones that aren't 3rd party)
+* Weather/water proofing seals
+
+## Prototype
+
+![Slicer Screenshot](images/2021-05-04_22-20.png)
+
+![Finished box](images/IMG_20210504_215351.jpg)