parser: add rudimentary README

askama_parser/README.md

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+# askama_parser: template parser for the Askama templating engine
+
+[![Documentation](https://docs.rs/askama_parser/badge.svg)](https://docs.rs/askama_parser/)
+[![Latest version](https://img.shields.io/crates/v/askama_parser.svg)](https://crates.io/crates/askama_parser)
+[![Build Status](https://github.com/djc/askama/workflows/CI/badge.svg)](https://github.com/djc/askama/actions?query=workflow%3ACI)
+[![Chat](https://badges.gitter.im/gitterHQ/gitter.svg)](https://gitter.im/djc/askama)
+
+This crate contains the procedural macros used by the
+[Askama](https://github.com/djc/askama) templating engine.