Updated documentation and added API.md to document the stable external wire format.

cmd/weatherfeeder/config.yml

@@ -1,12 +1,12 @@
 ---
 sources:
-#  - name: NWSObservationKSTL
-#    kind: observation
-#    driver: nws_observation
-#    every: 10m
-#    params:
-#      url: "https://api.weather.gov/stations/KSTL/observations/latest"
-#      user_agent: "HomeOps (eric@maximumdirect.net)"
+  - name: NWSObservationKSTL
+    kind: observation
+    driver: nws_observation
+    every: 10m
+    params:
+      url: "https://api.weather.gov/stations/KSTL/observations/latest"
+      user_agent: "HomeOps (eric@maximumdirect.net)"
 
 #  - name: OpenMeteoObservation
 #    kind: observation