Create README.md

README.md

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+# barnsley-fern-go
+Implementation of Barnsley Fern in Go
+
+![Barnsley Fern](https://raw.githubusercontent.com/dmfed/barnsley-fern-go/main/barnsley_fern.png "Fern")
+
+From the root of the repository
+```bash
+go build barnsley-fern.go 
+./barnsley-fern
+```
+or simply 
+```
+go run barnsley-fern.go
+```
+This will generate an image in current directory. 
+