Add true colour test script

demo/true.sh

@@ -0,0 +1,19 @@
+
+#!/bin/bash
+
+awk -v term_cols="${width:-$(tput cols || echo 80)}" 'BEGIN{
+
+
+    s="  ";
+        for (colnum = 0; colnum<term_cols; colnum++) {
+		        r = 255-(colnum*255/term_cols);
+			        g = (colnum*510/term_cols);
+				        b = (colnum*255/term_cols);
+					        if (g>255) g = 510-g;
+							        printf "\033[48;2;%d;%d;%dm", r,g,b;
+								        printf "\033[38;2;%d;%d;%dm", 255-r,255-g,255-b;
+									        printf "%s\033[0m", substr(s,colnum%2+1,1);
+										    }
+										        printf "\n";
+
+										}'