basic usage example

README.md

@@ -4,5 +4,45 @@ This library contains routines to create, read, and verify Arweave bundled data.
 
 This is the recommended way to write data to the Arweave network, as it provides a number of advantages over writing data over using regular transactions. See [ANS-102](https://github.com/ArweaveTeam/arweave-standards/blob/master/ans/ANS-102.md) for more details.
 
-This is a fully self-contained library. So all methods exposed in this library take a dependencies argument as their first value. This dependencies argument is methods that are available in arweave-js, or could be provided
-otherwise.
+This is a self-contained library, so, we need to initialize the API with a couple of dependencies
+
+```javascript
+
+import Arweave from 'arweave/node'
+import deepHash from 'arweave/common/lib/deepHash'
+import { ArDataApi } from 'arweave-data'
+
+const deps = {
+  utils: Arweave.utils,
+  crypto: Arweave.crypto,
+  deepHash: deepHash,
+}
+
+const ArData = ArDataApi(deps);
+
+async function makeSomeDataItems() {
+
+  const myTags = [
+    { name: 'App-Name', value: 'myApp' },
+    { name: 'App-Version', value: '1.0.0' }
+  ]
+
+  let data = ArData.createData({ to: 'awalleet', data: 'somemessage', tags: myTags }, jwk);
+
+  // Add some more tags after creation.
+  ArData.addTag(data, 'MyTag', 'value1')
+  ArData.addTag(data, 'MyTag', 'value2')
+
+  // Sign the data, ready to be added to a bundle
+  let data = await ArData.sign(data, jwk);
+
+  let verified = await ArData.verify(data);
+  // verified = true
+
+  // Cant modifiy it anymore or the signature will become invalid.  
+  ArData.addTag(data, 'AnotherTag', 'value2');
+
+  verified = await ArData.verify(signed)
+  // verified = false
+}
+```