Add janet logo,mMove some lib files to example.

examples/colors.janet

@@ -0,0 +1,41 @@
+# Ansi terminal colors
+
+(def- colormap
+  {:black 30
+   :bg-black 40
+   :red 31
+   :bg-red 41
+   :green 32
+   :bg-green 42
+   :yellow 33
+   :bg-yellow 43
+   :blue 34
+   :bg-blue 44
+   :magenta 35
+   :bg-magenta 45
+   :cyan 36
+   :bg-cyan 46
+   :white 37
+   :bg-white 47
+
+   :bright-black 90
+   :bg-bright-black 100
+   :bright-red 91
+   :bg-bright-red 101
+   :bright-green 92
+   :bg-bright-green 102
+   :bright-yellow 93
+   :bg-bright-yellow 103
+   :bright-blue 94
+   :bg-bright-blue 104
+   :bright-magenta 95
+   :bg-bright-magenta 105
+   :bright-cyan 96
+   :bg-bright-cyan 106
+   :bright-white 97
+   :bg-bright-white 107})
+
+(loop [[name color] :in (pairs colormap)]
+  (defglobal (string.slice name 1)
+    (fn color-wrapper [& pieces]
+      (string "\e[" color "m" (apply string pieces) "\e[0m"))))