Make nRF5 example fit better in nRF ecosystem

By making dir hierarchy replicate that of examples provided with the nRF
IoT SDK.

Also, example for Keil uVision IDE is added.

PUBLISHED_FROM=1a3d9a54d15eb1acfb1b5d162138576a387ed21c

examples/nRF52/README.md

@@ -1,38 +1,3 @@
-# nRF52 example project
-
-This example shows how to use mongoose on nRF52 boards.
-To run it you will need:
-
-- [nRF52 DK](https://www.nordicsemi.com/Products/Getting-started-with-the-nRF52-Development-Kit) dev board
-- Linux machine with 6lowpan module enabled. There are a few tutorials out there,
-  e.g [this one](https://devzone.nordicsemi.com/blogs/972/setting-up-ipv6-over-ble-using-nrf52-series-and-co/)
-- [Docker](https://docs.docker.com/engine/installation/linux/)
-
-## Building firmware and cleaning
-
-Nothing special: `make` and `make clean`.
-
-## Flashing
-
-`make flash`
-
-## Watch debug output
-
-This is a two-step process:
-
-- In a separate terminal, invoke `make jlinkexe`. It will run `JLinkExe`
-  utility, in which you'll need to type `connect`. You can actually do a lot of
-  things there, including halting and stopping the target, flashing firmware,
-  etc. You can type `?` to get the list of all available commands.
-- Now, in another terminal, invoke `make rtt`. It will start RTT client which
-  will connect to the running `JLinkExe` and will show logs from the device.
-
-## Debug with GDB
-
-This is a two-step process:
-
-- In a separate terminal, invoke `make gdbserver`. Note that `make jlinkexe`
-  and `make gdbserver`, unfortunately, cannot run sumultaneously.
-- Now, in another terminal, invoke `make gdb`. It will start GDB session which
-  will connect to the running GDB server.
+This is a Mongoose "Hello, world" that can be compiled under nRF IoT SDK.
 
+To make it work, you should download [nRF5 IoT SDK](http://developer.nordicsemi.com/nRF5_IoT_SDK/) and unpack it in current directory as `nrf5_iot_sdk`.