Added timebase

.svlint.toml

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+[textrules]
+header_copyright = false

ch4/.svlint.toml

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+[textrules]
+header_copyright = false

ch4/timebase.sv

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+`timescale 1ns/1ps

ch4/timebase_tb.sv

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+`timescale 1ns/1ps
+
+module timebase_tb();
+
+   logic clk;
+   logic reset;
+   logic [20:0] count;
+   
+   timebase test (clk, reset, count);
+
+   always
+      #5 clk = ~clk;
+   initial
+      clk = 0;
+
+   initial begin
+          reset = 1; 
+     #10; reset = 0; 
+   end
+
+endmodule