Add README

Include a readme with steps how to add/remove/update a key in the
keyring and how to release a new keyring version.

Signed-off-by: Jelle van der Waa <jelle@vdwaa.nl>

README.md

@@ -0,0 +1,21 @@
+# Arch Linux Keyring
+
+Repository for the Arch Linux keyring package.
+
+## Addition/Removal/Update of a packaging key
+
+1. Get the keyid from the bugreport in the [keyring
+   project](https://bugs.archlinux.org/index.php?project=7&do=index&switch=1)
+2. Add the keyid to `packager-keyids` in alphabetic order, following this
+   format: full size keyid, a tab, nickname.
+
+## Keyring release
+
+1. bump the version in the Makefile
+2. Run update-keys
+4. git add the new .asc file in the packager directory.
+4. Commit everything as 'Update keyring'
+5. Create a new tag ```git tag -s $(date +"%Y%m%d")```
+6. Push changes
+7. Upload the source tarball with ```make dist upload```
+8. Update the package