Add posibility to set rate limiting to locations

Add possibility to override rate limits to custom location
on ngix proxy.

fixes-bug: PROD-36891
Change-Id: I5668818b691089304cd7242a1c795d9c6109ca27
diff --git a/README.rst b/README.rst
index 48d23df..d7e9862 100644
--- a/README.rst
+++ b/README.rst
@@ -460,6 +460,36 @@
                   burst: 5
                   enabled: true
 
+To apply request limiting to particular location of particular site  `limit` should be
+applied on location level. Pay attention that location level overrides site level, 
+Two methods are supported:
+  - By IP
+  - By http requst method (get, post ...)
+for example:
+
+.. code-block:: yaml
+
+    nginx:
+      server:
+        site:
+          nginx_proxy_openstack_api_keystone:
+            location:
+              /some_location/:
+                limit:
+                  enabled: true
+                  methods:
+                    ip:
+                      enabled: True
+                    get:
+                      enabled: True
+                      rate: 120r/s
+                      burst: 600
+                      size: 20m
+                      nodelay: True
+                    post:
+                      enabled: True
+                      rate: 50r/m
+                      burst: 80
 
 Use `ngx_http_limit_conn_module` module that is used to set the shared memory
 zone and the maximum allowed number of connections for a given key value.