Add some tips about splitting and drag and drop

src/tips/tips.html

@@ -112,7 +112,7 @@ <h2><i class="fa fa-lightbulb-o" aria-hidden="true"></i> Tip: Use cursor mode an
 </article>
 
 <article>
-  <h2><i class="fa fa-lightbulb-o" aria-hidden="true"></i> Tip: Using text from a frame in a command pipe-line</h2>
+  <h2><i class="fa fa-lightbulb-o" aria-hidden="true"></i> Tip: Use text from a frame in a command pipe-line</h2>
   <p>
     Once <a href="https://github.com/sedwards2009/extraterm/blob/master/docs/guide.md#shell-integration">shell
     integration</a> is set up, Extraterm will place frames around the output of commands. Each frame has a little tag
@@ -145,5 +145,25 @@ <h2><i class="fa fa-lightbulb-o" aria-hidden="true"></i> Tip: Use the "Go to Pre
   </p>
 </article>
 
+<article>
+  <h2><i class="fa fa-lightbulb-o" aria-hidden="true"></i> Tip: Splitting the window</h2>
+  <p>
+    The "Horizontal Split" <span class="CLASS_KEYCAP" data-context="window" data-command="horizontalSplit"></span>
+    and "Vertical Split" <span class="CLASS_KEYCAP" data-context="window" data-command="verticalSplit"></span>
+    commands let you split the window in half with side-by-side groups of tabs. These too can be split again if
+    desired.
+  </p>
+  <p>
+    These commands are all available in the Command Palette <span class="CLASS_KEYCAP" data-context="terminal-viewer" data-command="openCommandPalette"></span>.
+  </p>
+</article>
+
+<article>
+  <h2><i class="fa fa-lightbulb-o" aria-hidden="true"></i> Tip: Drag and Drop tabs and command frames</h2>
+  <p>
+    Tabs can dragged around and repositioned using the mouse. Command frames can also be dragged out of the terminal and up to the tab bar. Command frames which hold text can also be dragged outside of Extraterm and dropped into any application which accepts text via drag and drop.
+  </p>
+</article>
+
 </body>
 </html>