add install message

Author: pr0grammr

messages.json

@@ -1,5 +1,5 @@
 {
-	"install": "README.md",
+	"install": "install.txt",
 	"1.0.1": "messages/1.0.1.txt",
 	"1.0.2": "messages/1.0.2.txt"
 }

messages/install.txt

@@ -0,0 +1,17 @@
+Thanks for installing C++ Classhelper!
+
+Usage: 
+------
+
+1. Right-click on a folder where you want to create your C++ Class
+2. Enter a name and the input below (without file extension)
+3. Hit return and your class will be created 
+
+HAVE FUN
+
+Customize: 
+----------
+
+You can customize the file extension by changing extension in Preferences -> Package Settings -> C++ Classhelper -> Settings user
+
+See all available settings in Preferences -> Package Settings -> C++ Classhelper -> Settings Default