Rename main folders and write sql backend adaptor

frontend/src/components/Loading/Loading.styles.js

@@ -0,0 +1,35 @@
+import { styled } from 'goober'
+
+export const Wrapper = styled('main')`
+  display: flex;
+  justify-content: center;
+  align-items: center;
+  min-height: 100vh;
+`
+
+export const Loader = styled('div')`
+  @keyframes load {
+    from {
+      transform: rotate(0deg);
+    }
+    to {
+      transform: rotate(360deg);
+    }
+  }
+
+  height: 24px;
+  width: 24px;
+  border: 3px solid var(--primary);
+  border-left-color: transparent;
+  border-radius: 100px;
+  animation: load .5s linear infinite;
+
+  @media (prefers-reduced-motion: reduce) {
+    animation: none;
+    border: 0;
+
+    &::before {
+      content: 'loading...';
+    }
+  }
+`