Update crate name and add README

Cargo.lock

@@ -1637,13 +1637,6 @@ version = "0.11.15"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "92c245af8786f6ac35f95ca14feca9119e71339aaab41e878e7cdd655c97e9e5"
 
-[[package]]
-name = "json-types"
-version = "0.1.0"
-dependencies = [
- "serde",
-]
-
 [[package]]
 name = "jsondocck"
 version = "0.1.0"
@@ -4393,17 +4386,24 @@ version = "0.0.0"
 dependencies = [
  "expect-test",
  "itertools 0.9.0",
- "json-types",
  "minifier",
  "pulldown-cmark 0.8.0",
  "regex",
  "rustc-rayon",
+ "rustdoc-json-types",
  "serde",
  "serde_json",
  "smallvec 1.4.2",
  "tempfile",
 ]
 
+[[package]]
+name = "rustdoc-json-types"
+version = "0.1.0"
+dependencies = [
+ "serde",
+]
+
 [[package]]
 name = "rustdoc-themes"
 version = "0.1.0"

src/librustdoc/Cargo.toml

@@ -17,7 +17,7 @@ smallvec = "1.0"
 tempfile = "3"
 itertools = "0.9"
 regex = "1"
-json-types = { path = "../rustdoc-json-types" }
+rustdoc-json-types = { path = "../rustdoc-json-types" }
 
 [dev-dependencies]
 expect-test = "1.0"

src/librustdoc/json/conversions.rs

@@ -9,7 +9,7 @@ use rustc_hir::def::CtorKind;
 use rustc_span::def_id::{DefId, CRATE_DEF_INDEX};
 use rustc_span::Pos;
 
-use json_types::*;
+use rustdoc_json_types::*;
 
 use crate::clean;
 use crate::formats::item_type::ItemType;

src/librustdoc/json/mod.rs

@@ -16,7 +16,7 @@ use rustc_middle::ty::TyCtxt;
 use rustc_session::Session;
 use rustc_span::edition::Edition;
 
-use json_types as types;
+use rustdoc_json_types as types;
 
 use crate::clean;
 use crate::config::{RenderInfo, RenderOptions};

src/rustdoc-json-types/Cargo.toml

@@ -1,5 +1,5 @@
 [package]
-name = "json-types"
+name = "rustdoc-json-types"
 version = "0.1.0"
 authors = ["The Rust Project Developers"]
 edition = "2018"

src/rustdoc-json-types/README.md

@@ -0,0 +1,12 @@
+# Rustdoc JSON Types
+
+This crate exposes the Rustdoc JSON API as a set of types with serde implementations.
+These types are part of the public interface of the rustdoc JSON output, and making them
+their own crate allows them to be versioned and distributed without having to depend on
+any rustc/rustdoc internals. This way, consumers can rely on this crate for both documentation
+of the output, and as a way to read the output easily, and its versioning is intended to
+follow semver guarantees about the version of the format. JSON format X will always be
+compatible with rustdoc-json-types version N.
+
+Currently, this crate is only used by rustdoc itself. Upon the stabilization of
+rustdoc-json, it may be start to be distributed separately for consumers of the API.