Add simple test for HTTP (WIP)

tests/testhttp.nim

@@ -0,0 +1,19 @@
+import unittest, json, chronicles
+import  ../rpcclient, ../rpchttpservers
+
+var srv = newRpcHttpServer(["localhost:8545"])
+var client = newRpcClient()
+
+# Create RPC on server
+srv.rpc("myProc") do(input: string, data: array[0..3, int]):
+  result = %("Hello " & input & " data: " & $data)
+
+srv.start()
+waitFor client.connect("localhost", Port(8545))
+
+var r = waitFor client.call("myProc", %[%"abc", %[1, 2, 3, 4]])
+echo r
+
+srv.stop()
+srv.close()
+echo "done"