Add separate docs for v0.8/v1

docs/_v0/4-features.md

@@ -0,0 +1,39 @@
+---
+title: Feature Flags
+nav_order: 5
+permalink: /v0/features/
+---
+
+# Feature Flags and Optional Dependencies
+
+- `derive` (enabled by default) - provides `#[derive(JsonSchema)]` macro
+- `impl_json_schema` - implements `JsonSchema` for Schemars types themselves
+- `preserve_order` - keep the order of struct fields in `Schema` and `SchemaObject`
+- `raw_value` - implements `JsonSchema` for `serde_json::value::RawValue` (enables the serde_json `raw_value` feature)
+
+Schemars can implement `JsonSchema` on types from several popular crates, enabled via feature flags (dependency versions are shown in brackets):
+
+- `chrono` - [chrono](https://crates.io/crates/chrono) (^0.4)
+- `indexmap1` - [indexmap](https://crates.io/crates/indexmap) (^1.2)
+- `indexmap2` - [indexmap](https://crates.io/crates/indexmap) (^2.0)
+- `either` - [either](https://crates.io/crates/either) (^1.3)
+- `uuid08` - [uuid](https://crates.io/crates/uuid) (^0.8)
+- `uuid1` - [uuid](https://crates.io/crates/uuid) (^1.0)
+- `smallvec` - [smallvec](https://crates.io/crates/smallvec) (^1.0)
+- `arrayvec05` - [arrayvec](https://crates.io/crates/arrayvec) (^0.5)
+- `arrayvec07` - [arrayvec](https://crates.io/crates/arrayvec) (^0.7)
+- `url` - [url](https://crates.io/crates/url) (^2.0)
+- `bytes` - [bytes](https://crates.io/crates/bytes) (^1.0)
+- `enumset` - [enumset](https://crates.io/crates/enumset) (^1.0)
+- `rust_decimal` - [rust_decimal](https://crates.io/crates/rust_decimal) (^1.0)
+- `bigdecimal03` - [bigdecimal](https://crates.io/crates/bigdecimal) (^0.3)
+- `bigdecimal04` - [bigdecimal](https://crates.io/crates/bigdecimal) (^0.4)
+- `smol_str` - [smol_str](https://crates.io/crates/smol_str) (^0.1.17)
+- `semver` - [semver](https://crates.io/crates/semver) (^1.0.9)
+
+For example, to implement `JsonSchema` on types from `chrono`, enable it as a feature in the `schemars` dependency in your `Cargo.toml` like so:
+
+```toml
+[dependencies]
+schemars = { version = "0.8", features = ["chrono"] }
+```