Update documentation for army corp WL

README.md

@@ -16,6 +16,7 @@ Searvey aims to provide the following functionality:
     - U.S. Center for Operational Oceanographic Products and Services (CO-OPS)
     - Flanders Marine Institute (VLIZ); Intergovernmental Oceanographic Commission (IOC)
     - U.S. Geological Survey (USGS)
+    - Army Corp WL
 
 ## Installation
 

docs/source/usace.rst

@@ -0,0 +1,15 @@
+USACE RiverGages
+==============
+The U.S. Army Corps of Engineers RiverGages <https://rivergages.mvr.usace.army.mil/>_
+system provides water level data for rivers and waterways across the United States.
+searvey uses the RiverGages REST API to access this data. Currently, water level
+data is exposed in searvey.
+
+The data from an individual station can be retrieved with:
+.. autofunction:: searvey.usace.get_usace_station
+
+You can fetch data from multiple stations and multiple different dates with:
+.. autofunction:: searvey.usace.fetch_usace
+
+Note: The verify=False parameter in the httpx.Client() is used here to bypass
+SSL verification, which is the only way to access the USACE RiverGages API.