add RTL2832U based SDR devices (#373)

vendor ID 0x1209, product ID: 0x2832

Author: hayguen

1209/2832/index.md

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+---
+layout: pid
+title: RTL2832U based SDR
+owner: librtlsdr
+license: GPL-2.0
+site: https://github.com/librtlsdr
+source: https://github.com/librtlsdr/librtlsdr
+---
+There are multiple vendors with different vendor/product IDs, see https://github.com/librtlsdr/librtlsdr/blob/master/rtl-sdr.rules
+But, because the dongles main purpose is DVB-T, usually the dvb-modules (or original drivers) will lock these devices - unless uninstalling or blacklisting.
+Registering a new vendor/product ID (not used from original drivers) will allow undisturbed use as SDR device.
+The USB-dongles vendor and product IDs can be modified utilitzing 'rtl_eeprom'.
+Main advantage is to allow usage of 2 devices - with and without modification - in parallel: one for watching DVB-T and the other as SDR.

org/librtlsdr/index.md

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+---
+layout: org
+title: librtlsdr
+site: https://github.com/librtlsdr
+---
+We are a few software developers doing hobbyist stuff around the RTL2832U based USB-dongles - used for SDR (software defined radio) purpose.