Add HTTP example for nRF

PUBLISHED_FROM=d9d979057d5269ac32d16545dd2489485bda642a

examples/nRF52/README.md

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+# 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.
+