makensis: add page (#2222)

pages/common/makensis.md

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+# makensis
+
+> Cross-platform compiler for NSIS installers.
+> It compiles a NSIS script into a Windows installer executable.
+
+- Compile a NSIS script:
+
+`makensis {{path/to/file.nsi}}`
+
+- Compile a NSIS script in strict mode (treat warnings as errors):
+
+`makensis -WX {{path/to/file.nsi}}`
+
+- Print help for a specific command:
+
+`makensis -CMDHELP {{command}}`