[Benchmark] Reorganize counter benchmarks. Move them to a directory and give specific naming regarding their functionality

openfpga_flow/benchmarks/micro_benchmark/counters/counter_8bit_async_resetb/counter.v

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+///////////////////////////////////////////
+//  Functionality: Counter with asynchronous reset
+//  Author:        Xifan Tang
+////////////////////////////////////////
+
+module counter (
+	clk,
+	resetb,
+	result
+);
+
+	input clk;
+	input resetb;
+	output [7:0] result;
+
+	reg [7:0] result;
+
+	always @(posedge clk or negedge resetb)
+	begin
+		if (!resetb) 
+			result = 0;		
+		else 
+			result = result + 1;
+	end
+endmodule		

openfpga_flow/benchmarks/micro_benchmark/counters/counter_8bit_async_resetb/counter_tb.v

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+module counter_tb;
+
+  reg clk, resetb;
+  wire [7:0] result;
+
+  counter DUT(
+    .clk(clk), 
+    .resetb(resetb), 
+    .result(result)
+  );
+  
+  initial begin
+    #0 resetb = 1'b0; clk = 1'b0;
+    #100 resetb = 1'b1;
+  end
+
+  always begin
+    #10 clk = ~clk;
+  end
+  
+  initial begin
+    #5000 $stop;
+  end
+
+endmodule