move examples to main repo so we can include_str them for publishing (#993)

* move exampels to main repo so we can include_str them for publishing

* update CI to not break examples

subxt/examples/storage_fetch.rs

@@ -0,0 +1,29 @@
+use sp_keyring::AccountKeyring;
+use subxt::{OnlineClient, PolkadotConfig};
+
+// Generate an interface that we can use from the node's metadata.
+#[subxt::subxt(runtime_metadata_path = "../artifacts/polkadot_metadata_small.scale")]
+pub mod polkadot {}
+
+#[tokio::main]
+async fn main() -> Result<(), Box<dyn std::error::Error>> {
+    // Create a new API client, configured to talk to Polkadot nodes.
+    let api = OnlineClient::<PolkadotConfig>::new().await?;
+
+    // Build a storage query to access account information.
+    let account = AccountKeyring::Alice.to_account_id().into();
+    let storage_query = polkadot::storage().system().account(&account);
+
+    // Use that query to `fetch` a result. This returns an `Option<_>`, which will be
+    // `None` if no value exists at the given address. You can also use `fetch_default`
+    // where applicable, which will return the default value if none exists.
+    let result = api
+        .storage()
+        .at_latest()
+        .await?
+        .fetch(&storage_query)
+        .await?;
+
+    println!("Alice has free balance: {}", result.unwrap().data.free);
+    Ok(())
+}