added sleeve aug api

doc/source/netscript/sleeveapi/getSleevePurchasableAugs.rst

@@ -0,0 +1,17 @@
+getSleevePurchasableAugs() Netscript Function
+=======================================
+
+.. js:function:: getSleevePurchasableAugs(sleeveNumber)
+
+    :param int sleeveNumber: Index of the sleeve to retrieve purchasable augmentations from. See :ref:`here <netscript_sleeveapi_referencingaduplicatesleeve>`
+
+    Return a list of augmentations that the player can buy for this sleeve.
+
+.. code-block:: javascript
+
+    [
+        {
+            name: string, // augmentation name
+            cost: number, // augmentation cost
+        }
+    ]