Added startup splash screen (android only)

web/splash/style.css

@@ -0,0 +1,56 @@
+html {
+  height: 100%
+}
+
+body {
+  margin: 0;
+  min-height: 100%;
+  background-color: #993333;
+  background-size: 100% 100%;
+}
+
+.center {
+  margin: 0;
+  position: absolute;
+  top: 50%;
+  left: 50%;
+  -ms-transform: translate(-50%, -50%);
+  transform: translate(-50%, -50%);
+}
+
+.contain {
+  display:block;
+  width:100%; height:100%;
+  object-fit: contain;
+}
+
+.stretch {
+  display:block;
+  width:100%; height:100%;
+}
+
+.cover {
+  display:block;
+  width:100%; height:100%;
+  object-fit: cover;
+}
+
+.bottom {
+  position: absolute;
+  bottom: 0;
+  left: 50%;
+  -ms-transform: translate(-50%, 0);
+  transform: translate(-50%, 0);
+}
+
+.bottomLeft {
+  position: absolute;
+  bottom: 0;
+  left: 0;
+}
+
+.bottomRight {
+  position: absolute;
+  bottom: 0;
+  right: 0;
+}