[ADD]: unregister-accounts

Signed-off-by: Stukalov-A-M <[email protected]>

src/cookbook/check-status.md

@@ -14,6 +14,10 @@ head:
 ```rust
     // To get the status, the Client struct already has a function get_status(),
     // so you may just execute it.
+    // The result message will include a deserialized json object with parameters like:
+    //  Quantity of peers
+    //  Quantity of blocks
+    //  Quantity of accepted and rejected transactions and some more
     let status = iroha_client.get_status().unwrap();
     println!("{:?}", status);
 ```

src/cookbook/unregister-accounts.md

@@ -11,4 +11,13 @@ head:
 
 # How to Unregister Accounts
 
-TODO
+```rust
+    //Note:
+    // Only domain owner or account with appropriate permission token can unregister another account
+    //First we need to define an account id that we want to unregister
+    let account_id = AccountId::from_str("artem@disneyland").unwrap();
+    //Then we need to define an Unregister expression
+    let expression = UnregisterExpr::new(account_id);
+    //And finally we need to send the transaction
+    iroha_client.submit_blocking(expression).unwrap();
+```