fix(readme): installation steps and examples

Author: KaiSchwarz-cnic

README.md

@@ -46,8 +46,8 @@ use WebService::Hexonet::Connector;
 
 my $cl = WebService::Hexonet::Connector::APIClient->new();
 $cl->useOTESystem();
-$cl->setCredentials("test.user", "test.passw0rd");
-$cl->setRemoteIPAddress("1.2.3.4");
+$cl->setCredentials('test.user', 'test.passw0rd');
+$cl->setRemoteIPAddress('1.2.3.4');
 
 my $response = $cl->login();
 # in case of 2FA use:
@@ -63,7 +63,7 @@ if ($response->isSuccess()) {
     # Call a command
     my $response = $cl->request(
         {
-            COMMAND => "QueryDomainList",
+            COMMAND => 'QueryDomainList',
             LIMIT => 5
         }
     );
@@ -75,15 +75,15 @@ if ($response->isSuccess()) {
     $res = $response->getPlain();
 
     # get the response code and the response description
-    my $code = $response->code();
-    my $description = $response->description();
+    my $code = $response->getCode();
+    my $description = $response->getDescription();
 
     print "$code $description";
 
     # close Backend API Session
     # you may verify the result of the logout procedure
     # like for the login procedure above
-    $r->logout();
+    $cl->logout();
 }
 ```
 
@@ -97,15 +97,15 @@ use WebService::Hexonet::Connector;
 
 my $cl = WebService::Hexonet::Connector::APIClient->new();
 $cl->useOTESystem();
-$cl->setCredentials("test.user", "test.passw0rd");
-$cl->setRemoteIPAddress("1.2.3.4");
+$cl->setCredentials('test.user', 'test.passw0rd');
+$cl->setRemoteIPAddress('1.2.3.4');
 # in case of 2FA use:
 # $cl->setOTP("12345678")
 
 # Call a command
 my $response = $cl->request(
     {
-        COMMAND => "QueryDomainList",
+        COMMAND => 'QueryDomainList',
         LIMIT => 5
     }
 );
@@ -117,8 +117,8 @@ $res = $response->getHash();
 $res = $response->getPlain();
 
 # get the response code and the response description
-my $code = $response->code();
-my $description = $response->description();
+my $code = $response->getCode();
+my $description = $response->getDescription();
 
 print "$code $description";
 ```