Fixes (#151)

* fix `Order` class

* make RFQ returned by `DevTools.createRfq` realistic

* refactor so its easier to call methods specific to an individual message kind (e.g. rfq)

* add npm script to auto generate API reference docs

* fix typo

* include request token when making request to get an exchange

* add placeholders for `Rfq.private`

* make `Resource` and abstract class

* implement Rfq method that checks vc's against an offering's `vcRequirements`

* bump version

* remove unused dependency hardlock dependency versions

js/README.md

@@ -1,7 +1,16 @@
 # tbDEX Protocol <!-- omit in toc -->
 
+Library that can be used to:
+* create, parse, verify, and validate the tbDEX Messages and Resources defined in the [protocol specification](../README.md)
+* send requests to PFIs
+# Table of Contents <!-- omit in toc -->
 - [Installation](#installation)
 - [Usage](#usage)
+  - [Message Creation](#message-creation)
+  - [Message Parsing](#message-parsing)
+  - [Message Validation](#message-validation)
+  - [Integrity Check](#integrity-check)
+  - [Sending Requests](#sending-requests)
 - [Development](#development)
   - [Prerequisites](#prerequisites)
     - [`node` and `npm`](#node-and-npm)
@@ -17,8 +26,70 @@ npm install @tbd54566975/tbdex
 ```
 
 # Usage
-TODO: Fill out
 
+## Message Creation
+There's a concrete class for each [Message Kind](../README.md#message-kinds). These classes can be used to create messages. e.g. 
+```typescript
+import { DevTools, Rfq } from '@tbd54566975/tbdex'
+
+const rfq = Rfq.create({
+  metadata : { from: alice.did, to: 'did:ex:pfi' },
+  data     : {
+    offeringId  : 'abcd123',
+    payinMethod : {
+      kind           : 'DEBIT_CARD',
+      paymentDetails : {
+        'cardNumber'     : '1234567890123456',
+        'expiryDate'     : '12/22',
+        'cardHolderName' : 'Ephraim Bartholomew Winthrop',
+        'cvv'            : '123'
+      }
+    },
+    payoutMethod: {
+      kind           : 'BTC_ADDRESS',
+      paymentDetails : {
+        btcAddress: '1A1zP1eP5QGefi2DMPTfTL5SLmv7DivfNa'
+      }
+    },
+    quoteAmountSubunits : '20000',
+    vcs                 : ''
+  }
+})
+
+await rfq.sign(alice)
+
+console.log(JSON.stringify(rfq, null, 2))
+```
+
+## Message Parsing
+All messages can be parsed from json into an instance of the Message Kind's class using the `Message.parse` method. e.g.
+
+```typescript
+import { Message } from '@tbd54566975/tbdex'
+
+const jsonMessage = "<SERIALIZED_MESSAGE>"
+const message = await Message.parse(jsonMessage)
+
+if (message.isRfq()) {
+  // rfq specific logic
+}
+```
+
+Parsing a message includes format validation and integrity checking
+
+## Message Validation
+> [!NOTE]
+>
+> TODO: Fill Out
+
+## Integrity Check
+> [!NOTE]
+>
+> TODO: Fill Out
+## Sending Requests
+> [!NOTE]
+>
+> TODO: Fill Out
 
 # Development