Update README

Signed-off-by: Taylor Smock <[email protected]>

README.md

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+README 
+======
+
+# Usage
+## Download MapRoulette Tasks
+There are two methods to download tasks from MapRoulette.
+1. From the JOSM `Download data` window (`OpenStreetMap data`, `Raw GPS data`, `Notes`, ..., `MapRoulette Tasks`)
+2. From the `MapRoulette Tasks` toggle dialog (`Download Data`) which downloads data in the current viewport
+
+## Workflow
+1. Select a MapRoulette task in the mapview *or* in the `MapRoulette Tasks` window
+2. Click on `Start Task` -- this will "lock" the task on MapRoulette until you finish and click on `Stop Task`.
+   This helps ensure that you aren't mapping something concurrently with someone else.
+3. Perform the task. Instructions can be viewed in the `Current MapRoulette Task` toggle dialog.
+4. In `Current MapRoulette Task`, select the appropriate action (`False Positive`, `Too hard/Cannot see`, `Fixed`,
+   `Already Fixed/Not an issue`, or `Skipped`; some options are hidden in drop-down menus).
+5. Uploading a changeset or `Stop Task` will then upload the task status.
+
+If a task specifies an OSM primitive
+
+# Author
+* Taylor Smock <[email protected]>
+
+# License
+GPLv3 or any later version