Add Nimble in libs directory

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+NimBLE Host ATT Client Reference
+--------------------------------
+
+Introduction
+~~~~~~~~~~~~
+
+The Attribute Protocol (ATT) is a mid-level protocol that all BLE devices use to exchange data. Data is exchanged when
+an ATT client reads or writes an attribute belonging to an ATT server. Any device that needs to send or receive data
+must support both the client and server functionality of the ATT protocol. The only devices which do not support ATT
+are the most basic ones: broadcasters and observers (i.e., beaconing devices and listening devices).
+
+Most ATT functionality is not interesting to an application. Rather than use ATT directly, an application uses the
+higher level GATT profile, which sits directly above ATT in the host. NimBLE exposes the few bits of ATT functionality
+which are not encompassed by higher level GATT functions. This section documents the ATT functionality that the NimBLE
+host exposes to the application.
+
+API
+~~~~~~
+
+.. doxygengroup:: bt_host
+    :content-only:
+    :members: