Add readme

LICENSE

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+Copyright 2022 s3lph
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of this software and
+associated documentation files (the "Software"), to deal in the Software without restriction,
+including without limitation the rights to use, copy, modify, merge, publish, distribute,
+sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all copies or
+substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT
+NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
+DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT
+OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

README.md

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+# ActivityPub Pelican Plugin
+
+Warning: This is an experimental plugin, which most likely does not do
+what you'd expect it to do.  Please read
+https://s3lph.me/activitypub-static-site.html for details.
+
+## Configuration
+
+Add the following to your pelicanconf.py:
+
+```python
+
+# Enable the plugin
+PLUGINS = ['activitypub']
+
+# Configure the author's profiles:
+
+ACTIVITYPUB_AUTHORS = {
+    # This user will be known as @alice@{{ SITEURL }} in the Fediverse
+    'alice': {
+        'name': 'Alice',
+        'movedTo': 'https://fedi.example/users/alice',
+        'alsoKnownAs': ['https://fedi.example/users/alice'],
+        'summary': 'Hi, I\'m Alice!  Please follow me at @alice@fedi.example.',
+        'attachment': [
+            {
+                'type': 'PropertyValue',
+                'name': 'Mastodon',
+                'value': '<a href="https://fedi.example/@alice">@alice@fedi.example</a>'
+            }
+        ],
+        'icon': {
+            'type': 'Image',
+            'mediaType': 'image/png',
+            'url': SITEURL + 'authors/alice.png'
+        }
+    }
+}
+```
+
+Apart from the ActivityPub resources, this plugin will also generate the following resources:
+
+- `.well-known/host-meta`
+- `.well-known/nodeinfo`
+- `.well-known/webfinger`
+
+If your Pelican site has multiple autors, you need to redirect `/.well-known/webfinger?resource=acct:alice@example.org` to `/.well-known/_webfinger/alice`.  This can e.g. be achieved with Apache `.htaccess`:
+
+```
+RewriteEngine on
+RewriteRule ^/.well-known/webfinger?resource=acct:([^@]+)@example.org$ /.well-known/_webfinger/$1 [L]
+```
+
+Apart from that, the following Content-Types have to be overwritten (again in Apache config):
+```
+<Location /activitypub>
+    Header set Content-Type "application/activity+json; charset=utf-8"
+</Location>
+<Location /.well-known/host-meta>
+    Header set Content-Type "application/xrd+xml; charset=utf-8"
+</Location>
+<Location /.well-known/webfinger>
+    Header set Content-Type "application/json; charset=utf-8"
+</Location>
+<Location /.well-known/nodeinfo>
+    Header set Content-Type "application/json; charset=utf-8"
+</Location>
+```