Add README.

Author: thorstel

README.asciidoc

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+= Advent of Code 2018
+
+I decided to use https://adventofcode.com/2018[Advent of Code 2018] as
+an opportunity to take a look at the Ada programming language.
+
+== Disclaimer
+
+I did not write even a single line of Ada before doing this. While I try
+to write clean code for my solutions, you should not expect to find
+examples of best practices here.
+
+In many cases I was too lazy to do the input handling inside my Ada
+programs. I often simply translated the input text file directly into
+Ada code (usally with vim macros). I wanted to focus on the actual
+problem (and learning the language) instead of trying to figure out how
+to do complex string parsing for the respective puzzle in Ada.
+
+The following solutions do not process the original input files:
+
+- Day 3
+- Day 4 (probably my most elaborate pre-processing of the given input)
+- Day 6
+- Day 9
+- Day 10
+- Day 11 (did not have an input file)
+- Day 12
+- Day 14 (did not have an input file)
+- Day 16
+- Day 17