Add examples to docs

docs/examples/1-derive_jsonschema.md

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+---
+layout: default
+title: Deriving JsonSchema
+parent: Examples
+nav_order: 1
+summary: Deriving JsonSchema on a struct and enum.
+---
+
+# Deriving JsonSchema
+
+This is the simplest usage of Schemars. Both types are made to derive `JsonSchema`, and the `schema_for!` macro is used to generate the schema itself.
+
+{% include example.md name="main" %}