android: add test server stub class. There aren't any credentials here yet, you'll have to add them yourself

android/src/main/java/net/monarchpass/piecannon/TestServer.java

@@ -0,0 +1,18 @@
+package net.monarchpass.piecannon;
+
+import net.monarchpass.piecannon.impl.SftpServer;
+import java.net.URI;
+
+public class TestServer extends SftpServer {
+    public TestServer () {
+        super(
+            "Test Server",
+            "",
+            22,
+            "",
+            "",
+            "",
+            URI.create("")
+        );
+    }
+}