Add exercises

SpinalTest/src/main/scala/spinaltest/Test.scala

@@ -0,0 +1,31 @@
+package spinaltest
+
+import spinal.core._
+import spinal.core.sim._
+
+class Counter extends Component {
+  val count = out(Reg(UInt(8 bits)).init(0))
+  count := count + 1
+}
+
+object Gen {
+  def main(args: Array[String]) {
+    SpinalVerilog(new Counter)
+  }
+}
+
+object Sim {
+  def main(args: Array[String]) {
+    SimConfig.withWave.compile(new Counter).doSim {dut =>
+      dut.clockDomain.forkStimulus(10)
+      var tick = 0
+
+      while (tick < 10) {
+        dut.clockDomain.waitSampling()
+        tick += 1
+      }
+
+      println(s"counter: ${dut.count.toBigInt}")
+    }
+  }
+}