[Benchmark] Add microbenchmark 1-bit blinking

openfpga_flow/benchmarks/micro_benchmark/blinking/blinking.v

@@ -0,0 +1,17 @@
+// ------------------------------
+// Design Name: Blinking
+// Functionality: 1-bit blinking
+// ------------------------------
+module blinking(
+  clk,
+  out
+);
+
+input clk;
+output out;
+
+  always @(posedge clk) begin
+    out = ~out;
+  end
+
+endmodule