added icons and moved to the css directory

css/loading_spinner.css

@@ -0,0 +1,32 @@
+@charset "UTF-8";
+
+@keyframes loading_spinner {
+	0% {
+		transform: rotate(0deg);
+	}
+
+	to {
+		transform: rotate(359deg);
+	}
+}
+
+i.icon.loading.spinner,
+i.icon.loading.spinner::before {
+	box-sizing: border-box;
+	position: relative;
+	display: block;
+	width: 20px;
+	height: 20px;
+}
+
+i.icon.loading.spinner::before {
+	content: "";
+	position: absolute;
+	border-radius: 100px;
+	border: 3px solid transparent;
+	border-top-color: currentColor;
+}
+
+i.icon.loading.spinner.animated::before {
+	animation: loading_spinner 1s cubic-bezier(0.6, 0, 0.4, 1) infinite;
+}