docs: Add documentation to a subset of available extensions (#24138)

I was able to use my experience with some of the Deno extensions to
flesh out their documentation a bit

I've provided docs for the following:
- web
- fetch
- net
- webidl
- url
- io
- crypto
- console

---------

Signed-off-by: Richard Carson <Rscarson@rogers.com>

1 files changed, 27 insertions, 1 deletions

diff --git a/ext/console/README.md b/ext/console/README.md
index 2f8fb448a..fab5f8536 100644
--- a/ext/console/README.md
+++ b/ext/console/README.md
@@ -1,5 +1,31 @@
 # deno_console
 
-This crate implements the Console API.
+**This crate implements the Console API.**
 
 Spec: https://console.spec.whatwg.org/
+
+## Usage Example
+
+From javascript, include the extension's source, and assign a console to the
+global scope:
+
+```javascript
+import * as console from "ext:deno_console/01_console.js";
+Object.defineProperty(globalThis, "console", {
+  value: new console.Console((msg, level) =>
+    globalThis.Deno.core.print(msg, level > 1)
+  ),
+  enumerable: false,
+  configurable: true,
+  writable: true,
+});
+```
+
+Then from rust, provide `deno_console::deno_console::init_ops_and_esm()` in the
+`extensions` field of your `RuntimeOptions`
+
+## Provided ops
+
+Following ops are provided, which can be accessed through `Deno.ops`:
+
+- op_preview_entries