chore: readme updated

packages/core/README.md

@@ -23,20 +23,20 @@ yarn add @signumjs/core
 #### Example
 
 ```js
-import {composeApi, ApiSettings} from '@signumjs/core'
+import {LedgerClientFactory} from '@signumjs/core'
 import {Amount} from '@signumjs/util'
 
-const apiSettings = new ApiSettings('https://testnet.signum.network:6876');
-const api = composeApi(apiSettings);
+const ledger = LedgerClientFactory.createClient({
+    nodeHost: "https://europe3.testnet.network"
+});
 
 // this self-executing file makes turns this file into a starting point of your app
 
 (async () => {
-    try{
-        const {balanceNQT} = await api.account.getAccountBalance('13036514135565182944')
+    try {
+        const {balanceNQT} = await ledger.account.getAccountBalance('13036514135565182944')
         console.log(`Account Balance: ${Amount.fromPlanck(balanceNQT).toString()}`)
-    }
-        catch(e){ // e is of type HttpError (as part of @signumjs/http)
+    } catch (e) { // e is of type HttpError (as part of @signumjs/http)
         console.error(`Whooops, something went wrong: ${e.message}`)
     }
 })()
@@ -57,12 +57,42 @@ Just import the package using the HTML `<script>` tag.
 #### Example
 
 ```js
-(function(){
-    const api = sig$.composeApi({nodeHost: "https://testnet.burstcoin.network:6876"});
-    api.network.getBlockchainStatus().then(console.log).catch(console.error);
+(() => {
+    const ledger = sig$. LedgerClientFactory.createClient( {nodeHost: "https://europe3.testnet.network"});
+    ledger.network.getBlockchainStatus().then(console.log).catch(console.error);
 })()
 ```
 
+## Initialize Crypto Module
+
+The above examples don't need any specific cryptographic features. But when it comes up to signing/creating transactions, deciphering P2P messages you may encounter the following error:
+
+```
+No Crypto Adapter provided - Use [Crypto.init()] first
+```
+
+You have to initialize the Crypto Module according to your platform somewhere in your apps entry point
+
+__NodeJS__
+
+```ts
+import {Crypto} from "@signumjs/crypto"
+import {NodeJSCryptoAdapter} from "@signumjs/crypto/adapters"
+
+Crypto.init(new NodeJSCryptoAdapter());
+```
+
+__Web/Browser__
+
+```ts
+import {Crypto} from "@signumjs/crypto"
+import {WebCryptoAdapter} from "@signumjs/crypto/adapters"
+
+Crypto.init(new WebCryptoAdapter());
+```
+
+> For React Native/Expo see [here](https://github.com/signum-network/signumjs-react-native-crypto-adapter)
+
 
 See more here:
 [@signumjs/core Online Documentation](https://signum-network.github.io/signumjs/modules/core.html)