chore: create README.md

Author: moul

gnoblog-cli/README.md

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+# GnoBlog CLI
+
+WIP, See [#1](https://github.com/gnolang/blog/issues/1)
+
+A standalone client to manage blogposts on [`r/gnoland/blog`](https://github.com/gnolang/gno/tree/master/examples/gno.land/r/gnoland/blog) powered by [`p/demo/blog`](https://github.com/gnolang/gno/tree/master/examples/gno.land/p/demo/blog).
+
+It parses blogposts located in [`../blog`](../blog) and publish them.
+
+(Current) live version: https://test3.gno.land/r/gnoland/blog