add quote to flutter wallet sdk (#296)

* add recovery to flutter wallet sdk

* add stellar to flutter wallet sdk

* update flutter wallet sdk version nr

* add quote to flutter wallet sdk

* fix sep-38 code style issues

docs/building-apps/wallet/component/dart/install.mdx

@@ -4,8 +4,8 @@ import { CodeExample } from "@site/src/components/CodeExample";
 
 ```dart
 // pubspec.yaml
-stellar_wallet_flutter_sdk: ^0.1.0
-stellar_flutter_sdk: ^1.7.1
+stellar_wallet_flutter_sdk: ^0.2.0
+stellar_flutter_sdk: ^1.7.4
 ```
 
 </CodeExample>

docs/building-apps/wallet/sep38.mdx

@@ -8,7 +8,7 @@ import { LanguageSpecific } from "@site/src/components/LanguageSpecific";
 import { WalletCodeExample as CodeExample } from "@site/src/components/WalletCodeExample";
 import Header from "./component/header.mdx";
 
-<Header WIPLangs={["kotlin", "dart"]} />
+<Header WIPLangs={["kotlin"]} />
 
 The [SEP-38] standard defines a way for anchors to provide quotes for the exchange of an off-chain asset and a different on-chain asset, and vice versa. Quotes may be [indicative](https://www.investopedia.com/terms/i/indicativequote.asp) or [firm](https://www.investopedia.com/terms/f/firmquote.asp) ones. When either is used is explained in the sections below.
 
@@ -28,6 +28,14 @@ const authToken = await auth.authenticate({ accountKp });
 const sep38 = anchor.sep38(authToken);
 ```
 
+```dart
+var accountKp = ... // our account keypair
+
+var auth = await anchor.sep10();
+var authToken = await auth.authenticate(accountKp);
+var sep38 = anchor.sep38(authToken: authToken);
+```
+
 </CodeExample>
 
 ## Get Anchor Information
@@ -40,6 +48,10 @@ First, let's get information about the anchor's support for [SEP-38]. The respon
 const resp = await sep38.info();
 ```
 
+```dart
+var resp = await sep38.info();
+```
+
 </CodeExample>
 
 For example a response will look like this. The asset identifiers are described below in [Asset Identification Format](#asset-identification-format).
@@ -99,6 +111,13 @@ const resp = await sep38.prices({
 });
 ```
 
+```dart
+var resp = await sep38.prices(
+  sellAsset: "iso4217:USD",
+  sellAmount: "5",
+);
+```
+
 </CodeExample>
 
 The response gives the asset prices for exchanging the requested sell asset. For example, a response look like this:
@@ -135,6 +154,16 @@ const resp = await sep38.price({
 });
 ```
 
+```dart
+var resp = await sep38.price(
+  sellAsset: "iso4217:USD",
+  buyAsset:
+    "stellar:SRT:GCDNJUBQSX7AJWLJACMJ7I4BC3Z47BQUTMHEICZLE6MU4KQBRYG5JY6B",
+  sellAmount: "5",
+  context: "sep6",
+);
+```
+
 </CodeExample>
 
 The response gives information for exchanging these assets. For example, a response will look like this:
@@ -161,6 +190,16 @@ const requestResp = await sep38.requestQuote({
 });
 ```
 
+```dart
+var requestResp = await sep38.requestQuote(
+  sellAsset: "iso4217:USD",
+  buyAsset:
+    "stellar:SRT:GCDNJUBQSX7AJWLJACMJ7I4BC3Z47BQUTMHEICZLE6MU4KQBRYG5JY6B",
+  sellAmount: "5",
+  context: "sep6",
+);
+```
+
 </CodeExample>
 
 However now the response gives an `id` that we can use to identify the quote. The `expires_at` field tells us how long the anchor will wait to receive funds for this quote.
@@ -190,6 +229,11 @@ const quoteId = requestResp.id;
 const getResp = await sep38.getQuote(quoteId);
 ```
 
+```dart
+var quoteId = requestResp.id;
+var getResp = await sep38.getQuote(quoteId);
+```
+
 </CodeExample>
 
 The response should match the one given from `.requestQuote()` we made earlier.