Add changelog.md and initial mermaid doc placeholder

CHANGELOG.md

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+# Changelog
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]
+Add DFRPG character generation
+
+## [0.1.0] - 2020-12-01
+First release
+Add priest spells for AD&D
+
+### Added
+- This release already has lots of features
+
+[0.1.0]: https://github.com/MaxWilson/ShiningSword/releases/tag/v0.1.0

docs/DFRPG_Chargen.md

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+# DFRPG Chargen Design Doc
+
+## Requirements
+
+Supports all DFRPG Adventurers templates
+Skills, advantages, disadvantages, quirks
+Random attribute generation option
+Doesn't double-charge for things that show up in multiple sections, like disadvantages or quirk buys
+
+```mermaid
+stateDiagram-v2
+    state Chargen {
+      [*] --> RollAttributes
+      RollAttributes --> ChooseProfession
+      RollAttributes --> ChooseRace
+      ChooseRace --> RollAttributes
+      ChooseProfession --> CompleteTemplate
+      ChooseProfession --> AddQuirks
+      CompleteTemplate --> BuyEquipment
+      BuyEquipment --> Save
+      AddQuirks --> Save
+      RollAttributes: Roll Attributes (optional)
+      ChooseRace: Choose Race (optional)
+      ChooseProfession: Choose Profession (radio buttons, collapsible, remember preference, allows random)
+      CompleteTemplate: Complete template (250 point budget)
+      AddQuirks: Add quirks (optional, raises budget)
+      BuyEquipment: Buy equipment
+      Save: Save character
+      Save --> [*]
+      }
+    state "Advancement" as Advancement {
+      Save2: Save character2
+      [*] --> AddToTemplate
+      AddToTemplate --> BuyMoreEquipment
+      BuyMoreEquipment --> SaveAgain
+      SaveAgain --> [*]
+      AddToTemplate: Add more traits (above initial 250 point limit)
+      SaveAgain: Save changes
+      BuyMoreEquipment: Spend cash, buy more stuff
+      }
+    [*] --> Chargen
+    Chargen --> Advancement
+    Advancement --> Advancement
+    Advancement --> [*]
+```