#332 Add first three official tips

src/ca/mcgill/cs/jetuml/JetUML.properties

@@ -166,7 +166,7 @@ warning.version.title=Diagram Version Migration
 files.image.name=Image Files
 tips.jsons.directory=/tips
 tips.images.directory=/tip_images
-tips.quantity=2
+tips.quantity=3
 
 # Menu
 file.text=File

tipdata/tips/tip-2.json

@@ -1,7 +1,7 @@
 { 
-  "title": "Copying Diagram to Clipboard",
+  "title": "Creating Nodes",
   "content": [ 
-    { "image": "tip2.PNG"},
-    { "text": "Using the \"copy to clipboard\" tool is a convenient way to screen grab the current diagram with no grid."}
+    { "text": "Selecting a node type in the toolbar enables the corresponding \"Node creation tool\". With a node creation tool enabled, click on an empty space in the diagram to create a new node of that type. Rolling over the tool in the toolbar shows a tooltip with the name of the node type."},
+    { "image": "tip2.png"}
   ]
 }

tipdata/tips/tip-3.json

@@ -0,0 +1,7 @@
+{ 
+  "title": "Creating Edges",
+  "content": [ 
+    { "text": "To create an edge between two nodes, select an \"Edge Creation Tool\" in the toolbar, click in the start edge, then start dragging with the mouse. This will enable a \"Rubberband\" view of the start and end nodes for the edge. Release the mouse on the destination edge to complete the operation. Edges are laid out automatically: to control their path it is necessary to move their start and end nodes. The edge creation operation will not have any effect if the edge type is not a valid way to connect the selected nodes." },
+  	{ "image": "tip3.png"}
+  ]
+}