added readme and license

README.md

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+## Contents
+
+This repo contains `.scad` and `.stl` files for catears as well as other animal ear headbands which use Bezier curves for their fitting shape.
+
+## Structure
+
+The folder `scad` contains all `.scad` files. 
+- The folder `base` contains those modules which the animal ear headbands use.
+- The folder `test` contains test files.
+
+The folder `stl` contain all `.stl` files, including those for animal ear headbands with standard settings.
+- The folder `test` contains `.stl` files for test prints.
+
+## Print settings
+
+### catears
+
+It's recommended to print the catears using **PETG**.
+
+### dogears
+
+It's recommended to print the dogears using **PETG**. Due to the details needed for the hinges in the dogears to work as well as their small size, it's recommended to print the dogears with a **layer height of 0.25mm or less**. Using a **perimeter of 3mm** and **infill of 0%** one can reduce weight while keeping the ears stable. One can print the **tips of the ears with an infill of 90%** to make the ears stay low.
+
+## License
+
+This work is licensed under <a href="https://creativecommons.org/licenses/by-sa/4.0/">CC BY-SA 4.0</a><img src="https://mirrors.creativecommons.org/presskit/icons/cc.svg" alt="" style="max-width: 1em;max-height:1em;margin-left: .2em;"><img src="https://mirrors.creativecommons.org/presskit/icons/by.svg" alt="" style="max-width: 1em;max-height:1em;margin-left: .2em;"><img src="https://mirrors.creativecommons.org/presskit/icons/sa.svg" alt="" style="max-width: 1em;max-height:1em;margin-left: .2em;">