starting work on UI

src/ui/widgets/sidebar.py

@@ -0,0 +1,28 @@
+from textual.containers import Vertical, VerticalScroll, Horizontal
+from textual.widgets import Button, ListView
+from textual.app import ComposeResult
+
+from ui.widgets.channel import Channel
+
+
+class Sidebar(Vertical):
+    DEFAULT_CSS = """
+    Sidebar {
+        dock: left;
+        background: $surface;
+        width: 40;
+        border-right: tall $surface-lighten-1;
+        padding: 1;
+        
+        #add-channel {
+            min-width: 100%;
+            margin: 1
+        }
+    }
+    """
+    
+    def compose(self) -> ComposeResult:
+        with VerticalScroll(id="channels"):
+            yield Channel()
+            yield Channel()
+            yield Button("+ New Channel", variant="success", id="add-channel")