Add d-lang snippets (#281)

Adapted for yas from
https://github.com/dlang-vscode/dlang-vscode/blob/master/snippets/snippets.json

Author: gizmomogwai

snippets/d-mode/class

@@ -0,0 +1,14 @@
+# -*- mode: snippet -*-
+# name: class … { … }
+# key: class
+# --
+/++
+ + $1
+ +/
+class ${1:ClassName}
+{
+	this($2)
+	{
+      $0
+	}
+}

snippets/d-mode/debug

@@ -0,0 +1,8 @@
+# -*- mode: snippet -*-
+# name: debug
+# key: debug
+# --
+debug
+{
+	$0
+}

snippets/d-mode/debugm

@@ -0,0 +1,8 @@
+# -*- mode: snippet -*-
+# name: debugm
+# key: debugm
+# --
+debugm (${1:module})
+{
+	$0
+}

snippets/d-mode/enum

@@ -0,0 +1,8 @@
+# -*- mode: snippet -*-
+# name: enum … { … } 
+# key: enum
+# --
+enum ${1:name}
+{
+	$0
+}

snippets/d-mode/fe

@@ -0,0 +1,8 @@
+# -*- mode: snippet -*-
+# name: foreach (e ; …) { … }
+# key: fe
+# --
+foreach (${1:e} ; $2)
+{
+	$0
+}

snippets/d-mode/fer

@@ -0,0 +1,8 @@
+# -*- mode: snippet -*-
+# name: foreach_reverse (e ; …) { … }
+# key: fer
+# --
+foreach_reverse (${1:e} ; $2)
+{
+	$0
+}

snippets/d-mode/if

@@ -0,0 +1,9 @@
+# -*- mode: snippet -*-
+# name: if …
+# key: if
+# --
+if ($1)
+{
+  $2
+}
+$0

snippets/d-mode/ife

@@ -0,0 +1,13 @@
+# -*- mode: snippet -*-
+# name: if … else
+# key: ife
+# --
+if ($1)
+{
+  $2
+}
+else
+{
+	$3
+}
+$0

snippets/d-mode/im

@@ -0,0 +1,6 @@
+# -*- mode: snippet -*-
+# name: import …
+# key: import
+# --
+import ${1:module};
+$0

snippets/d-mode/main

@@ -0,0 +1,8 @@
+# -*- mode: snippet -*-
+# name: int main(string[] args) { … }
+# key: main
+# --
+int main(string[] args)
+{
+	$0
+}