update scripts

README.md

@@ -1 +1,36 @@
-<img src="./300.png">
+![300 stars!](./300.png)
+
+
+## Running Locally
+### Requirements
+Go 1.16+ is required because [embed][embed] is used for input files.
+
+Use `go run main.go -part <1 or 2>` will be usable to run the actual inputs for that day.
+
+Use `go test -run RegExpToMatchFunctionNames .` to run examples and unit tests via the `main_test.go` files.
+
+## Scripts (used for all years but 2019)
+Makefile should be fairly self-documenting. Alternatively you can run the binaries yourself via `go run` or `go build`.
+
+`make help` prints a help message.
+
+### Make skeleton files
+```sh
+for ((i=1; i<26; i++)); do
+make skeleton DAY=$i YEAR=2021
+done
+```
+
+Note that skeletons use [embed][embed] and __will not compile__ without an `input.txt` file located in the same folder. Input files can be made via `make input`.
+```sh
+make skeleton DAY=5 YEAR=2020
+make input DAY=5 YEAR=2020 AOC_SESSION_COOKIE=your_cookie
+```
+
+### Fetch inputs and write to input.txt files
+Requires passing your cookie from AOC from either `-cookie` flag, or `AOC_SESSION_COOKIE` env variable.
+```sh
+make input DAY=1 YEAR=2020
+```
+
+[embed]: https://golang.org/pkg/embed/