doc: Add links to more supported software.

Julien LepillerFri Sep 13 11:42:51+0200 2019

952a41a

doc: Add links to more supported software. doc/README.md: Add links to more supported software.

doc/README.md

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* [Hexchat](doc/hexchat.md)
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#### Security Software
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* [KeepassXC](doc/keepassxc.md)
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* [OpenSSH](doc/ssh.md)
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### Common Issues
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#### No Sound on the System