added Glossary

GLOSSARY.md

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+Glossary
+========
+
+Canonical URL
+--------
+base\_url + base\_path + permalink
+
+Base URL
+----
+
+base\_url is the point of ownership
+
+In most cases that would be https://johndoe.com
+
+In some cases that might be https://school.edu/~/johndoe
+
+It does NOT include a trailing /
+
+Base Path
+-----
+
+base\_path is the blog directory
+
+In most cases that would be / or /blog/
+
+It DOES include BOTH a LEADING and TRAILING slash.
+
+In the case of https://school.edu/~/johndoe/weblog, the base\_path would  be /weblog/.
+
+Permalink
+------
+
+The permalink is the permanent part of the URL, after the path to the blog.
+
+For example:
+
+  * http://blog.johndoe.com/articles/first-post.html the permalink is articles/first-post.html
+  * http://johndoe.com/blog/articles/first-post.html the permalink is still articles/first-post.html
+  * http://school.edu/~/johndoe/blog/articles/first-post.html the permalink is yet still articles/first-post.html
+
+The permalink is ALWAYS RELATIVE (no leading slash)
+
+It is designed so that if you ever move your blog from one domain, point of ownership, or path to a new one,
+a very simple one-line redirect can be made to your webserver and all of the posts will end up in the right place
+once again.
+
+base\_url  the
+permalink refers to