externals/nrf52: Add a README to show the download location for nRF5

The original archive file can be downloaded as a zip on the site.
sonydevworld · Aug 2, 2022 · 92c894a · 92c894a
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+# Original Code Location
+
+The original codes of nRF5_SDK_17.1.0_ddde560 can be downloaded as a zip file
+from the following site:
+
+Download:
+https://www.nordicsemi.com/Products/Development-software/nRF5-SDK/Download
+Version:    17.1.0
+SoftDevice: SI32
+Target:     nRF52840
+File name:  nRF5_SDK_17.1.0_ddde560.zip