Adding basic catalog documentation

Author: dcarbone

docs/CATALOG.md

@@ -13,4 +13,99 @@ $catalog = $client->Catalog();
 
 ## Actions
 
-###
+### Register Node, Service, or Check
+
+For this endpoint, you must first create a [CatalogRegistration](./src/Catalog/CatalogRegistration.php)
+object.  Below is a quick example on how to do this with a Service:
+
+```php
+$catalogRegistration = new \DCarbone\PHPConsulAPI\Catalog\CatalogRegistration(
+    array(
+        'Node' => 'name of node',
+        'Address' => 'address of node',
+        'Service' => new \DCarbone\PHPConsulAPI\Agent\AgentService(
+            array(
+                'Service' => 'dan-no-space-test',
+            )
+        )
+    )
+);
+
+list($wm, $err) = $client->Catalog()->register($catalogRegistration);
+if (null !== $err)
+    die($err);
+
+var_dump($wm);
+```
+
+### Deregister Node, Service, or Check
+
+For this endpoint, you must first create a [CatalogDeregistration](./src/Catalog/CatalogDeregistration.php)
+object.  Below is an example of how to deregister the service created above:
+
+```php
+
+$catalogDeregistration = new \DCarbone\PHPConsulAPI\Catalog\CatalogDeregistration(
+    array(
+        'Node' => 'name of node',
+        'Address' => 'address of node',
+        'ServiceID' => 'dan-no-space-test'
+    )
+);
+
+list($wm, $err) = $client->Catalog()->deregister($catalogDeregistration);
+if (null !== $err)
+    die($err);
+
+var_dump($wm);
+```
+
+### List Datacenters
+
+```php
+list ($datacenters, $err) = $client->Catalog()->datacenters();
+if (null !== $err)
+    die($err);
+
+var_dump($datacenters);
+```
+
+### List Nodes
+
+```php
+list($nodes, $qm, $err) = $client->Catalog()->nodes();
+if (null !== $err)
+    die($err);
+
+var_dump($nodes, $qm);
+```
+
+### List Services
+
+```php
+list($services, $qm, $err) = $client->Catalog()->services();
+if (null !== $err)
+    die($err);
+
+var_dump($services, $qm);
+```
+
+### Get Specific Service
+
+```php
+list($service, $qm, $err) = $client->Catalog()->service('servicename');
+if (null !== $err)
+    die($err);
+
+var_dump($service, $qm);
+```
+
+### Get Specific Node
+
+```php
+list($node, $qm, $err) = $client->Catalog()->node('nodename');
+if (null !== $err)
+    die($err);
+
+var_dump($err);
+```