Added README file.

README.md

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+# YAML support for the Go language
+
+This package is a pure port of the [libyaml](http://pyyaml.org/wiki/LibYAML)
+C library for the Go language.
+
+Import path
+-----------
+
+The yaml package should be imported as:
+
+  * [gonuts.org/v1/yaml](gonuts.org/v1/yaml)
+
+This URL works with "go get", and it also leads to the package documentation
+if opened with a browser. The package API for yaml v1 will remain stable as
+described in [gonuts.org](gonuts.org).