Add message and field snippets for proto filetype

UltiSnips/proto.snippets

@@ -0,0 +1,30 @@
+priority -50
+
+snippet mess "Proto message" b
+// ${2:TODO(`whoami`): Describe this message.}
+message ${1:Name} {
+
+	// Next available id: 1
+}
+endsnippet
+
+snippet reqf "Required field" b
+// ${4:TODO(`whoami`): Describe this field.}
+optional ${1:type} ${2:name} = ${3:1};  // Required
+endsnippet
+
+snippet optf "Optional field" b
+// ${4:TODO(`whoami`): Describe this field.}
+optional ${1:type} ${2:name} = ${3:1};
+endsnippet
+
+snippet repf "Repeated field" b
+// ${4:TODO(`whoami`): Describe this field.}
+repeated ${1:type} ${2:name} = ${3:1};
+endsnippet
+
+snippet enum "Enumeration" b
+// ${2:TODO(`whoami`): Describe this enum.}
+enum ${1:Name} {
+}
+endsnippet