Add degreesToRads and radsToDegrees

snippets/degreesToRads.md

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+### degreesToRads
+
+Converts an angle from degrees to radians.
+
+Use `Math.PI` and the degree to radian formula to convert the angle from degrees to radians.
+
+```js
+const degreesToRads = deg => deg * Math.PI / 180.0;
+```
+
+```js
+degreesToRads(90.0); // ~1.5708
+```

snippets/radsToDegrees.md

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+### radsToDegrees
+
+Converts an angle from radians to degrees.
+
+Use `Math.PI` and the radian to degree formula to convert the angle from radians to degrees.
+
+```js
+const radsToDegrees = rad => rad * 180.0 / Math.PI;
+```
+
+```js
+radsToDegrees(Math.PI / 2); // 90
+```