Add docs folder for basic documentation configuration

docs/config.qdocconf

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+include(html-template.qdocconf)
+
+project = libnymea-networkmanager
+description = libnymea-networkmanager documentation
+
+dita.metadata.default.author      = Simon Stürz
+dita.metadata.default.permissions = all
+dita.metadata.default.publisher   = guh GmbH
+dita.metadata.default.copyryear = 2019
+dita.metadata.default.copyrholder = Simon Stürz
+dita.metadata.default.audience = programmer
+
+outputdir = html
+outputformats = HTML
+
+language = Cpp
+
+naturallanguage         = en_US
+outputencoding          = UTF-8
+sourceencoding          = UTF-8
+
+syntaxhighlighting = true
+
+headerdirs = ../libnymea-networkmanager
+sourcedirs = ../libnymea-networkmanager ../docs
+
+headers.fileextensions = "*.h"
+sources.fileextensions = "*.cpp *.qdoc"
+
+Cpp.ignoredirectives = Q_DECLARE_METATYPE Q_DECLARE_LOGGING_CATEGORY Q_LOGGING_CATEGORY Q_ENUM
+

docs/html-template.qdocconf

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+HTML.templatedir = .
+
+HTML.postpostheader = \
+    "<div class=\"content mainContent\">\n"
+
+HTML.prologue = \
+    "<div class=\"context\">\n"
+
+HTML.footer = \
+    "</div>\n" \
+    "</div>\n"
+

docs/index.qdoc

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+/*!
+    \page index.html
+    \title libnymea-networkmanager documentation
+
+    The libnymea-networkmanager library allowes to interact with the network-manager DBus API and optional start also a Bluetooth LE server for remote network set up.
+
+    \chapter Classes network-manager
+    \annotatedlist networkmanager
+
+    \chapter Classes network-manager bluetooth
+    \annotatedlist networkmanager-bluetooth
+
+*/
+