Add README with the background and process proposal

Author: Jakuje

README.md

@@ -0,0 +1,44 @@
+# The OpenSC wiki
+
+This is an OpenSC wiki. Authoritative source for the wiki rendered on Github
+OpenSC repository:
+
+https://github.com/OpenSC/OpenSC/wiki
+
+## Why?
+
+It used to be accessible for everyone to edit, until we got some malicious
+actors trying to sneak in malware download links.
+
+Now, it lives in separate repository https://github.com/OpenSC/Wiki where
+we accept contributions through pull requests.
+
+## How to update wiki
+
+### Contributors
+
+Open a pull request with your changes as you would do with your code changes
+in this repository.
+
+Do not use the "Edit" button on the wiki pages directly (accessible only for
+project members now).
+
+### Maintainers
+
+This git repository is an authoritative source of truth. Do NOT use the Edit
+button on the wiki.
+
+Once the commit is merged to this repository, it needs to be manually pushed
+to the OpenSC wiki. Recommended approach is to configure the opensc wiki
+remote in your git client:
+```
+git remote add opensc.wiki https://github.com/OpenSC/OpenSC.wiki.git
+```
+and once there is a change, pull it locally and push it to the opensc.wiki
+```
+git pull origin
+git push opensc.wiki
+```
+
+If the branches diverge for some reason, please investigate where did the
+changes come from and sync the repositories.