Initial documentation stub (docs/technical/)

docs/technical/README.md

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+## PyLink Developer Documentation
+
+Please note that as PyLink is still in its development phase, the API is subject to change.
+Any documentation here is provided for reference only.
+
+### Introduction
+
+PyLink is a modular, plugin-based IRC PseudoService framework. It uses swappable protocol modules and a hook-based system for calling plugins, which aim, together, to provide a consistent API.
+
+![Diagram of PyLink's core structure](core-structure.png)
+
+### Contents
+
+TBD.

docs/technical/core-structure.dot

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+digraph G {
+	IRCd -> "Protocol module" -> "PyLink Core" -> "PyLink hooks" -> Plugins;
+	Plugins -> "Protocol module" [label="Communicates via\n*Client/*Server API\ncommands"] [color=navyblue] [fontcolor=navyblue];
+	Plugins -> "PyLink Core" [label="Adds commands &\nhook handlers via\nutils.add_cmd/add_hook"] [color=brown] [fontcolor=brown];
+	"Protocol module" -> IRCd;
+}