add turtle benchmark and reorganize (nushell#259)

Author: fdncred

benchmarks/README.md

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+# Benchmark Scripts
+
+### Definition
+
+These scripts are used to benchmark certain aspects of nushell.

coloring/gradient-autoview.nu renamed to benchmarks/gradient-autoview.nu

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+# The infamous turtle benchmark
+def turtle [column: string] {
+    wrap $column | table
+}
+
+print -n "Turtle 1 = "
+"turtle" | turtle 1 | str length
+print -n "Turtle 2 = "
+"turtle" | turtle 1 | turtle 2 | str length
+print -n "Turtle 3 = "
+"turtle" | turtle 1 | turtle 2 | turtle 3 | str length
+print -n "Turtle 4 = "
+"turtle" | turtle 1 | turtle 2 | turtle 3 | turtle 4 | str length
+print -n "Turtle 5 = "
+"turtle" | turtle 1 | turtle 2 | turtle 3 | turtle 4 | turtle 5 | str length