Add installBackdoor

doc/source/netscript/singularityfunctions/installBackdoor.rst

@@ -0,0 +1,22 @@
+installBackdoor() Netscript Function
+====================================
+
+.. js:function:: installBackdoor()
+
+    :RAM cost: 2 GB
+
+    If you are not in BitNode-4, then you must have Level 1 of Source-File 4 in order to use this function.
+
+    This function will install a backdoor on the server you are currently connected to.
+
+    Examples:
+
+    .. code-block:: javascript
+
+        connect("foodnstuff");
+        installBackdoor();
+
+    .. warning::
+        For NS2 users:
+
+        This function is async.