QML: Add inytoduction for tabs

Signed-off-by: Juraj Oravec <jurajoravec@mailo.com>

qml/articles/10.Falkon_tabs.md

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+# Falkon QML Tutorial - 10. Falkon tabs
+
+Hello, in this chapter I will show you how to work with tabs. Keep in
+mind that this is just a short example and always check documentation
+for more information, do not trust me.
+
+## Access tabs api
+The tabs API can be accessed through code.
+```qml
+Falkon.Tabs
+```
+More information can be found in the
+[documentation](http://falkon.sgorava.xyz/docs/class_qml_tabs.html).
+
+Most of the functions also returns a result of the operation which can
+be either `True` or `False`.
+
+## Switching tabs
+The current tab can be changed to `previous`, `next` and based on tab
+`id` as it is stored in Falkon. These function needs to specify the
+`windowId` and the previous and next tab is based on some Falkon
+thing which can be changed at least by C++ addon (investigate
+VerticalTabs extension).
+
+```qml
+// the id of the first window is 0, so good enough for an example
+property int window = 0
+
+Falkon.Tabs.nextTab(window)
+Falkon.Tabs.previousTab(window)
+Falkon.Tabs.setCurrentIndex({
+    windowId: window,
+    index: 0
+})
+```
+
+## TabBar related operations
+We can `move`, `pin`, `unpin`, `detach`, `duplicate`, `close`, `reload`,
+`stop` loading and `add` a tab.
+
+```qml
+// the id of the first window is 0, so good enough for an example
+property int window = 0
+property int tabIndexFirst = 0
+property int tabIndexSecond = 1
+
+// Move second tab to the first position
+Falkon.Tabs.moveTab({
+    from: tabIndexSecond,
+    to: tabIndexFirst,
+    windowId: window
+})
+// Create a new tab
+Falkon.Tabs.addTab({
+    url: 'https://falkon.org/',
+    windowId: window
+})
+
+// The other commands are exactly the same
+Falkon.Tabs.pinTab({
+    index: tabIndexFirst,
+    windowId: window
+})
+Falkon.Tabs.unpinTab({
+    index: tabIndexFirst,
+    windowId: window
+})
+Falkon.Tabs.detachTab()
+Falkon.Tabs.duplicateTab()
+Falkon.Tabs.closeTab()
+Falkon.Tabs.reloadTab()
+Falkon.Tabs.stopTab()
+```
+
+## Misc
+Next we can get an exact tab or all tabs in given window, tab counts and
+search in tabs.
+
+```qml
+// the id of the first window is 0, so good enough for an example
+property int window = 0
+property int tabIndexFirst = 0
+
+var tab = Falkon.Tabs.get({
+    index: tabIndexFirst,
+    windowId: window
+})
+var tabsAll = Falkon.Tabs.getAll({
+    windowId: window,
+    withPinned: true
+})
+vat tabs = Falkon.Tabs.search({
+    title: 'Falkon',
+    url: 'https://falkon.org/',
+    withPinned: true
+})
+var tabsNormal = Falkon.Tabs.normalTabsCount(window)
+var tabsPinned = Falkon.Tabs.pinnedTabsCount(window)
+```