update with day04 and first puzzle of day05

day05/notes.md

@@ -0,0 +1,12 @@
+## Day 5: Cafeteria
+
+Puzzle 1 took me 30-ish minutes to figure out. I initially tried building an array of numbers from the ranges, but it turned out to be _much_ easier to parse each range against each value and let the machine do the math.
+
+Puzzle 2 seemed pretty straightforward, and I thought I had a simple solution, but it didn't work, and an hour later (1:30a), I have to admit defeat for tonight.
+
+### JS Solutions
+
+```
+cd js
+node day05a.js
+```