add flying sections

source/flying.rst

@@ -1,4 +1,12 @@
 Flying tips
 ===========
 
-Coming soon!
+The Humanitarian OpenStreetMap team has guidelines on `flying for UAV mapping <https://uav-guidelines.openaerialmap.org/>`_:
+
+- `choosing the right uav <https://uav-guidelines.openaerialmap.org/pages/05-choosing-the-right-uav/>`_ 
+
+- `choosing the right sensor <https://uav-guidelines.openaerialmap.org/pages/06-choosing-the-sensor/>`_ 
+
+- `mission preparation <https://uav-guidelines.openaerialmap.org/pages/07-preparing-for-the-uav-mission/>`_
+
+The guidelines are intended for mapping projects on Pacific Islands, but have general use for all drone mappers.