Added initial token/theme styles and theme service.

JSMR.UI.Blazor/wwwroot/css/utilities.css

@@ -0,0 +1,39 @@
+.text-primary {
+    color: var(--sys-color-primary);
+}
+
+.text-secondary {
+    color: var(--sys-color-secondary);
+}
+
+.text-success {
+    color: var(--sys-color-success);
+}
+
+.text-warning {
+    color: var(--sys-color-warning);
+}
+
+.text-danger {
+    color: var(--sys-color-danger);
+}
+
+.bg-primary {
+    background: var(--sys-color-primary);
+}
+
+.bg-secondary {
+    background: var(--sys-color-secondary);
+}
+
+.bg-black {
+    background: #000;
+}
+
+.bg-surface {
+    background: var(--sys-surface);
+}
+
+.border-primary {
+    border-color: var(--sys-color-primary);
+}