Added initialisation blocks for PC and GPR's

modules/instruction_counter.sv

@@ -8,6 +8,11 @@ module instruction_counter #(parameter width=5)(
 );
 
     logic [2**width-1:0] pc;
+
+    initial begin
+        pc = {(2**width){1'b0}};
+    end
+
     always_ff @(posedge clk) begin
         if (we) begin
             pc <= W;