Added openapi viewers

ref #6

src/static/docs/redoc.html

@@ -0,0 +1,18 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <title>ReDoc</title>
+    <meta charset="utf-8"/>
+    <meta name="viewport" content="width=device-width, initial-scale=1">
+    <style>
+      body {
+        margin: 0;
+        padding: 0;
+      }
+    </style>
+  </head>
+  <body>
+    <redoc spec-url='/api/docs/openapi.json'></redoc>
+    <script src="./redoc.standalone.js"> </script>
+  </body>
+</html>