Add docs on generating schemas

docs/3-generating.md

@@ -7,4 +7,19 @@ permalink: /generating/
 
 # Generating Schemas
 
-Using the `schema_for!` macro, and `gen` module...
+The easiest way to generate a schema for a type that implements is to use the [`schema_for!` macro](https://docs.rs/schemars/latest/schemars/macro.schema_for.html), like so:
+```rust
+let my_schema = schema_for!(MyStruct);
+```
+
+This will create a schema that conforms to [JSON Schema Draft 7](https://json-schema.org/specification-links.html#draft-7), but this is liable to change in a future version of Schemars if support for other JSON Schema versions is added.
+
+If you want more control over how the schema is generated, you can use the [`gen` module](https://docs.rs/schemars/latest/schemars/gen/). There are two main types in this module:
+* [`SchemaSettings`](https://docs.rs/schemars/0.6.1/schemars/gen/struct.SchemaSettings.html), which defines what JSON Schema features should be used when generating schemas (for example, how `Option`s should be represented).
+* [`SchemaGenerator`](https://docs.rs/schemars/0.6.1/schemars/gen/struct.SchemaGenerator.html), which manages the generation of a schema document.
+
+See the API documentation for more info on how to use those types for custom schema generation.
+
+<!-- TODO: 
+create and link to example
+-->

docs/404.html

@@ -2,6 +2,7 @@
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+title: Not Found
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