Update README

README.md

@@ -8,7 +8,7 @@ This step extracts bounding boxes for populated places from  the OS Open Names d
 
     go run ./cmd/save-gob/... opname_csv_gb.zip ./pkg/placenames/placenames.bin
 
-I have included a the compiled extract in this repository so you can skip this step.
+I have included a compiled extract in this repository so you can skip this step.
 
 ## Binary embedding
 
@@ -16,14 +16,66 @@ We use [mule](https://github.com/wlbr/mule) to embed the gob data in the compile
 
     go get github.com/wlbr/mule
 
-Make sure the `mule` command is on you PATH before running `go generate`.
+Make sure the `mule` command is on your PATH before running `go generate`.
     
 ## Compiling
 
-    mudir -p bin
+    mkdir -p bin
     go generate ./...
     go build -o bin ./...
 
+## Usage
+
+### analyze-gpx
+
+To analyze a single GPX track:
+
+    ./bin/analyze-gpx FILENAME
+    
+This will write a JSON summary to STDOUT.
+
+To analyze an entire directory:
+
+    ./bin/analyze-gpx DIRNAME
+    
+This will scan the directory and, for each file with suffix `.gpx`, will output the analysis to a corresponding file with suffix `.json`.
+
+### serve-rwgps
+
+This will start a small server to analyze [RideWithGPS](https://ridewithgps.com/) tracks. 
+
+    ./bin/serve-rwgps
+
+It defaults to listening on port 8000, override by setting the `LISTEN_ADDR` environment variable:
+
+    LISTEN_ADDR=127.0.0.1:3000 ./bin/serve-rwgps
+    
+Then to query a route:
+
+    curl http://localhost:3000/rwgps?routeId=30165378  
+
 ## Attribution
 
 Contains OS data © Crown copyright and database right 2018
+
+## MIT License
+
+Copyright (c) 2020 Raymond Miller
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.