Create README.md

2019/README.md

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+## MB’s Advent of Code tips
+
+* Complex numbers are a nice way of modeling two-dimensional positions.
+
+* Use lists whenever feasible, because there are many useful list functions in the Racket library that don’t have vector equivalents.
+
+* In particular, [these list functions](https://docs.racket-lang.org/reference/pairs.html?q=racket%2Flist#%28part._.Additional_.List_.Functions_and_.Synonyms%29) are very useful.
+
+* The `graph` library can be useful for graph-based problems.
+
+## My solutions
+
+I try to write solutions that are succinct but not cryptic. 
+
+I don’t optimize for speed.