Add README badges for web app, JOSS and docs

README.md

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+![PASCal](https://img.shields.io/badge/try-PASCal-navy?style=flat&color=navy&cacheSeconds=3600&link=https%3A%2F%2Fpascalapp.co.uk)
+[![JOSS](https://joss.theoj.org/papers/3bfe66743c9a86f34d3c1b2f17906261/status.svg)](https://joss.theoj.org/papers/3bfe66743c9a86f34d3c1b2f17906261)
+![Documentation](https://img.shields.io/badge/docs-online-black?style=flat&logoColor=white&logo=bookstack&color=olive&cacheSeconds=3600&link=https%3A%2F%2Fdocs.pascalapp.co.uk)
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 Principal Axis Strain Calculator (PASCal) is a web tool and open source software package designed to help scientists analyse non-ambient lattice parameter data.
 It is written entirely in Python, using plotly to visualise the data, and is also available without installation as a web tool, available at [pascalapp.co.uk](https://pascalapp.co.uk).
 The code is available at [MJCliffe/PASCal](https://github.com/MJCliffe/PASCal) on GitHub, and the documentation at [docs.pascalapp.co.uk](https://docs.pascalapp.co.uk).