Add code generator for 2021 and update README

README.md

@@ -1,3 +1,56 @@
 # Advent of Code 2021
 
-The 2021 iteration of Advent of Code. This year I am going to try and accomplish it all on my iPad using GitPod
+The 2021 iteration of Advent of Code. This year I am going to try and accomplish it all on my iPad using GitPod
+
+## Adding a new day
+
+When starting to solve for a new day run the following command in the root of the repo where `<day>` is the go lang compatible package name (i.e. `four` or `five`) and `<noun>` represents the item the day's problem revolves around (i.e. `radar` or `bingo`).
+
+```sh
+./setup.sh <day> <noun>
+```
+
+After generating a new package update [`main.go`](main.go) to include a `<day>` flag in the switch statement on line 28
+
+```go
+  case "<day>":
+		day = <day>.Init("<day>/input.txt")
+```
+
+## My Solutions
+
+### Day 1
+
+```sh
+$ ./aoc2021 --one
+The solution for "one" is:
+There were 1715 increases in depth
+There were 1739 increases in depth when sampling a window
+```
+
+### Day 2
+
+```sh 
+$ ./aoc2021 --two
+The solution for "two" is:
+Horizontal is 1832, depth is 1172, answer is 2147104
+Horizontal is 1832, depth is 1116059, answer is 2044620088
+```
+
+### Day 3
+
+```sh
+$ ./aoc2021 --three
+The solution for "three" is:
+The power rates are gamma: 1143, epsilon: 2952, for 3374136 total
+The oxygen rating is 1909 and CO2 rating is 2322, for a life support rating of 4432698
+```
+
+### Day 4
+
+```sh
+$ ./aoc2021 --four
+The solution for "four" is:
+The winning score is 668 on call 66. Final score 44088
+The last winning score is 263 on call 90. Final score 23670
+```