add test files for NSIS syntax

tests/syntax-tests/highlighted/NSIS/test.nsi

@@ -0,0 +1,61 @@
+/*
+ * Multi-line
+ * Comment
+ */
+
+# Single-line comment
+; Another-single line comment
+
+; Includes
+!include "LogicLib.nsh"
+
+; Defines
+!define ARCHITECTURE "x64"
+
+; Compile time command
+!echo "Building ${ARCHITECTURE} script"
+
+; Macro definition
+!macro SayHello name
+    !ifdef name
+        !echo "Hello, ${name}"
+    !else
+        !echo "Hello, world"
+    !endif
+!macroend
+
+; Macro usage
+!insertmacro SayHello "John Doe"
+
+; Settings
+Name "installer_name"
+OutFile "installer_name.exe"
+RequestExecutionLevel user
+CRCCheck on
+Unicode true
+
+!ifdef ${ARCHITECTURE}
+  InstallDir "$PROGRAMFILES64\installer_name"
+!else
+  InstallDir "$PROGRAMFILES\installer_name"
+!endif
+
+; Pages
+Page components
+Page instfiles
+
+; Functions
+Function PrintTestStrings
+  DetailPrint "The install button reads $(^InstallBtn)"
+  DetailPrint 'Here comes a$\n$\rline-break!'
+  DetailPrint `Escape the dollar-sign: $$`
+FunctionEnd
+
+; Sections
+Section "section_name" section_index
+    Call PrintTestStrings    
+
+    ; NSIS plugin call
+    nsExec::ExecToLog "calc.exe"
+SectionEnd
+