first attempt for ps api

rowers/templates/developers.html

@@ -208,6 +208,32 @@
             </td>
 
           </tr>
+          <tr>
+            <td>Planned Session</td>
+            <td><a href="/rowers/api/plannedsessions/">/rowers/api/plannedsessions/</a>
+              <br>
+            <a href="/rowers/api/plannedsessions/1">/rowers/api/plannedsessions/{id}</a></td>
+            <td>GET, POST, DELETE</td>
+            <td>
+              <pre>{
+            "id": 17,
+            "name": "Test Session",
+            "comment": "",
+            "startdate": "2021-01-25",
+            "enddate": "2021-01-31",
+            "preferreddate": "2021-01-29",
+            "sessiontype": "session",
+            "sessionvalue": 60,
+            "sessionunit": "min",
+            "sessionmode": "time",
+            "manager": 1,
+            "course": null
+        }
+              </pre>
+            </td>
+
+          </tr>
+
           <tr>
             <td>Challenge</td>
             <td><a href="/rowers/api/challenges/">/rowers/api/challenges/</a>