Add readme

geojson2csv/README.md

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+# geojson2csv
+Github Action for tansforming geojson FeatureCollections to CSVs with WKT geometry. 
+
+## Usage
+
+## Example Workflow file
+
+An example workflow to transform a geojson in the repository
+
+```
+workflow "Deploy geometries" {
+  on = "deployment"
+  resolves = "Transform to csv"
+}
+
+action "Transform to csv" {
+  uses = "unacast/actions/geojson2csv@master"
+  runs = "geojson2csv"
+  args = "input.geojson output.csv"
+}
+```