Add file PyProject;

Support display of a single pubsub node item;
Update document README;
Modularize code;

README.md

@@ -73,15 +73,57 @@ JabberCard requires an XMPP account to work, it only needs an XMPP server.
 - XEP-0060: Publish-Subscribe
 - XEP-0292: vCard4 Over XMPP
 
-## Install
+## Installation
 
-Use the following commands, to begin JabberCard.
+It is possible to install JabberCard using pip and pipx.
+
+#### pip inside venv
 
-```shell
-git clone https://git.xmpp-it.net/sch/JabberCard
-cd JabberCard/
-python -m uvicorn fasi:app
 ```
+$ python3 -m venv .venv
+$ source .venv/bin/activate
+```
+
+##### Install
+
+```
+$ pip install git+https://git.xmpp-it.net/sch/JabberCard
+```
+
+#### pipx
+
+##### Install
+
+```
+$ pipx install git+https://git.xmpp-it.net/sch/JabberCard
+```
+
+##### Update
+
+```
+$ pipx reinstall jabbercard
+```
+
+```
+$ pipx uninstall jabbercard
+$ pipx install git+https://git.xmpp-it.net/sch/JabberCard
+```
+
+### Configure
+
+Copy file `settings.toml` to `~/.config/jabbercard/`.
+
+Copy directories `css`, `img`, and `template` to `~/.local/share/jabbercard/`.
+
+Copy files `clients.toml`, and `systems.toml` to `~/.local/share/jabbercard/`.
+
+### Start
+
+```
+$ jabbercard
+```
+
+Open URL http://localhost:8000 and connect with your Jabber ID.
 
 ## License
 
@@ -101,7 +143,7 @@ Schimon Jehudah Zachary 2024
 
 ## Thanks
 
-A special thank you for Mr. Georg Lukas of [op-co.de](https://op-co.de/) from
+A special thank you for Mr. Georg Lukas of [op-co.de](https://op-co.de) from
 Germany, who has gracefully published a sophisticated client-side HTML
 invitation page, and consequently exposed that idea to the founder of this
 project.