spectre-meltdown-checker: add page (#5670)

pages/linux/spectre-meltdown-checker.md

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+# spectre-meltdown-checker
+
+> Spectre and Meltdown mitigation detection tool.
+> More information: <https://manned.org/spectre-meltdown-checker.1>.
+
+- Check the currently running kernel for Spectre or Meltdown:
+
+`sudo spectre-meltdown-checker`
+
+- Check the currently running kernel and show an explanation of the actions to take in order to mitigate a vulnerability:
+
+`sudo spectre-meltdown-checker --explain`
+
+- Check for specific variants (defaults to all):
+
+`sudo spectre-meltdown-checker --variant {{1|2|3|3a|4|l1tf|msbds|mfbds|mlpds|mdsum|taa|mcespc|srbds}}`
+
+- Display output using a specific output format:
+
+`sudo spectre-meltdown-checker --batch {{text|json|nrpe|prometheus|short}}`
+
+- Don't use the `/sys` interface even if present:
+
+`sudo spectre-meltdown-checker --no-sysfs`
+
+- Check a non-running kernel:
+
+`sudo spectre-meltdown-checker --kernel {{path/to/kernel_file}}`