Add alternate implementations for day 1, and create README of results.

2020/README.md

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+# Results
+
+## Day 1
+```
+AOC 2020
+Day 1 - Part 1 - binary : 1006875
+        generator: 12.539µs,
+        runner: 373ns
+
+Day 1 - Part 1 - linear : 1006875
+        generator: 4.945µs,
+        runner: 7.727µs
+
+Day 1 - Part 1 - set : 1006875
+        generator: 16.721µs,
+        runner: 1.288µs
+
+Day 1 - Part 2 : 165026160
+        generator: 4.272µs,
+        runner: 1.225545ms
+```
+
+## Day 2
+```
+AOC 2020
+Day 2 - Part 1 : 640
+        generator: 1.821498ms,
+        runner: 115.525µs
+
+Day 2 - Part 2 : 472
+        generator: 1.52241ms,
+        runner: 10.459µs
+```