[gcr/wip/nielsdg/remove-autotools: 3/3] Convert README to markdown

[Niels De Graef <nielsdg src gnome org>]

commit cc249521fc8e0b1f62e0e145a975582afcb8b3fa
Author: Niels De Graef <nielsdegraef gmail com>
Date:   Mon Sep 28 07:59:12 2020 +0200

    Convert README to markdown

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 README.md | 60 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 60 insertions(+), 33 deletions(-)
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+GCR
+===
+GCR is a library for displaying certificates and crypto UI, accessing
+key stores. It also provides the viewer for crypto files on the GNOME
+desktop.
+
+GCK is a library for accessing PKCS#11 modules like smart cards, in a
+(G)object oriented way.
+
+Building
+--------
+
+You can build GCR using [Meson] with the following build commands (replace
+`$BUILDDIR` with your chosed build directory).
+
+```
+$ meson $BUILDDIR
+$ meson compile -C $BUILDDIR
+$ meson install -C $BUILDDIR
+```
+
+Contributing
+------------
+The code and issue tracker of GCR can be found at the GNOME GitLab instance at
+https://gitlab.gnome.org/GNOME/gcr.
+
+If you would like to get involved with GNOME projects, please also visit our
+[Newcomers page] on the Wiki.
+
+Debug tracing
+-------------
+The Gcr and Gck libraries contain statements which help debug flow
+and logic. In many cases these help you track down problems.
+
+Use the environment variable `G_MESSAGES_DEBUG='all'` or
+`G_MESSAGES_DEBUG='xxx'` to display either all messages or a specific categories
+of debug messages. You can separate categories in this list with spaces, commas
+or semicolons. Gcr library uses category 'Gcr', while Gck library uses category
+'Gck'.
+
+```
+# Example to display all debug messages:
+$ G_MESSAGES_DEBUG=all gcr-viewer /path/to/certificate.crt
+
+# Example to display debug messages for a specific category:
+$ G_MESSAGES_DEBUG="Gcr" gcr-viewer /path/to/certificate.crt
+```
+
+For the Gck debug messages simply replace 'Gcr' with 'Gck' in the above
+examples.
+
+More information
+----------------
+To discuss issues with developers and other users, you can post to the
+[GNOME Discourse instance](https://discourse.gnome.org).
+
+
+
+[Meson]: https://mesonbuild.com
+[Newcomers page]: https://wiki.gnome.org/TranslationProject/JoiningTranslation