Add Xcelium scripts

test-xcelium/__build.sh

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+#!/usr/bin/env bash
+set -e
+
+rm -rf xcelium.d
+
+xmvlog -sv -f ../source/sources.f top.sv
+xmelab -timescale 1ps/1ps top

test-xcelium/__run.sh

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+#!/usr/bin/env bash
+
+xmsim -status top

test-xcelium/top.sv

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+`timescale 1ps/1ps
+
+module top;
+    logic clock = 1'b0;
+    initial forever #(10ns/2) clock = ~clock;
+    testbench testbench (clock);
+endmodule