Add glossary page

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docs/src/content/docs/Reference/glossary.md

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+---
+title: Glossary
+---
+
+![Resolver spec visual draft](./docs/public/resolver-spec-food-analogy-drawing.jpg)
+
+:::note
+Creating tokens is like cooking. You can cook an infinity of dishes (final tokens) by following recipes (sources) which are a combination of different types (dimension) of food (modifiers).
+:::
+
+## Token set
+
+A token set is a group of tokens. You have 2 types of token sets:
+
+1. [modifier](#modifier) token sets
+2. [source](#source) token sets
+
+## Dimension
+
+Dimensions are categories used to organize your tokens. See them as contexts in which token values might change:
+
+- Brands
+- Surface
+- Language direction
+- Themes
+- Platform
+- Screen size
+- Density
+- Component
+- State
+- Variant
+- Contrast
+- ...
+
+## Modifier
+
+A modifier token set is a group of token used by source token set(s). You'll usually want to organize them in different [dimensions](#dimension).
+
+![Dimension examples](./docs/public/spectrum-adaptive-ui-concept.png)
+
+## Source
+
+A source set is combination of one or several modifier set used to match a specific use case. For instance, generating a themes token sets based on several modifier sets.
+
+## Resolver
+
+A design token resolver is a function responsible for creating design tokens respecting [the DTCG spec](https://first-editors-draft.tr.designtokens.org/format/) from another source of data or logic.
+
+## Token space
+
+TBD
+
+## Resolution request
+
+TBD