initial nsis script

script/nsis/.gitattributes

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+* eol=crlf

script/nsis/.gitignore

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+*.exe

script/nsis/installer.nsi

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+Name    "Git LFS"
+OutFile "GitLFSInstaller.exe"
+
+
+InstallDir $DESKTOP
+
+VIProductVersion "0.6.0.0"
+VIAddVersionKey ProductName      "Git LFS"
+VIAddVersionKey Comments         "Git LFS tool"
+VIAddVersionKey CompanyName      "GitHub, Inc"
+VIAddVersionKey LegalCopyright   "GitHub, Inc"
+VIAddVersionKey FileDescription  "Git LFS Tool"
+VIAddVersionKey FileVersion      1
+VIAddVersionKey ProductVersion   1
+VIAddVersionKey InternalName     "Git LFS"
+VIAddVersionKey LegalTrademarks  "something, something, darkside"
+VIAddVersionKey OriginalFilename "GitLFSInstaller.exe"
+
+Function .onGUIInit
+  IfFileExists $PROGRAMFILES64\Git\mingw64\bin\git.exe 0 +3
+    StrCpy $INSTDIR "$PROGRAMFILES64\Git\mingw64\bin"
+    Goto exit
+
+  IfFileExists $PROGRAMFILES64\Git\bin\git.exe 0 +3
+    StrCpy $INSTDIR "$PROGRAMFILES64\Git\bin"
+    Goto exit
+
+  IfFileExists $PROGRAMFILES\Git\bin\git.exe 0 exit
+    StrCpy $INSTDIR "$PROGRAMFILES\Git\bin\git.exe"
+
+  exit:
+    SetOutPath $INSTDIR
+FunctionEnd
+
+Function .onInstSuccess
+  MessageBox MB_OK "Open your Git Bash and run 'git lfs init' to get started."
+FunctionEnd
+
+Page license
+Page directory
+Page instfiles
+LicenseData ..\..\LICENSE.md
+
+Section
+  File git-lfs.exe
+  WriteUninstaller $INSTDIR\git-lfs-uninstaller.exe
+SectionEnd
+
+
+Section "Uninstall"
+  Delete $INSTDIR\git-lfs-uninstaller.exe
+  Delete $INSTDIR\git-lfs.exe
+SectionEnd