started sidebar implementation

src/components/Sidebar.css

@@ -0,0 +1,45 @@
+.sidebar {
+  position: fixed;
+  top: 0;
+  left: 0;
+  height: 100vh;
+  width: 250px;
+  background-color: #fff;
+  box-shadow: 2px 0 10px rgba(0, 0, 0, 0.1);
+  border-right: 1px solid #e5e7eb;
+}
+
+.sidebar-header {
+  padding: 1.5rem;
+  border-bottom: 1px solid #e5e7eb;
+  background-color: #f9fafb;
+}
+
+.sidebar-title {
+  margin: 0;
+  font-size: 1.25rem;
+  font-weight: 600;
+  color: #374151;
+}
+
+.sidebar-nav {
+  padding: 1rem 0;
+}
+
+.sidebar-link {
+  display: block;
+  padding: 0.75rem 1.5rem;
+  color: #374151;
+  text-decoration: none;
+  transition: background-color 0.2s ease;
+  border-left: 3px solid transparent;
+}
+
+.sidebar-link:hover {
+  background-color: #f3f4f6;
+  border-left-color: #3b82f6;
+}
+
+.sidebar-link:active {
+  background-color: #e5e7eb;
+}