show message after install of package via package control

Author: runxel

Messages/install.txt

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+Thanks for installing the Sublime Text package for GDL!
+
+
+How to use
+===============
+
+From now you can just select `GDL` from the code-language menu in the bottom right corner of Sublime Text.
+BUT wait! There's more!
+
+Activate the color scheme
+-------------------------
+
+Activate color scheme by modifying a syntax specific preferences file, which you can find using the menu item `Preferences -> Settings - More -> Syntax Specific – User`.
+
+Copy this into the new file and save:
+
+{
+	"color_scheme": "Packages/GDL/GDL.tmTheme"
+}
+
+
+GDL color scheme
+----------------
+
+This color scheme is especially made for a comfortable working GDL coding environment in Sublime Text.

messages.json

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+{
+  "install": "messages/install.txt"
+}