add first links

hardware.md

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+Hardware
+========
+
+SDR
+---
+
+* [RTL-SDR](http://www.rtl-sdr.com/)
+* [BladeRF](http://nuand.com/)
+* [HackRF](https://greatscottgadgets.com/hackrf/)
+* [rad1o](http://rad1o.badge.events.ccc.de/)
+* [USRP](https://www.ettus.com/product/category/USRP-X-Series)

links.md

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+links
+=====
+
+* [Signal Identification Wiki](http://www.sigidwiki.com)

software.md

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+Software
+========
+
+* [gqrx](http://gqrx.dk/)
+* [GNURadio](http://gnuradio.org/)
+* [minimodem](http://www.whence.com/minimodem/)
+* [slowrx](https://github.com/windytan/slowrx)
+* [redsea](https://github.com/windytan/redsea)