infection: add page (#2633)

pages/common/infection.md

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+# infection
+
+> A mutation testing framework for PHP.
+
+- Analyse code using the configuration file (or create one if it does not exist):
+
+`infection`
+
+- Use a specific number of threads:
+
+`infection --threads {{number_of_threads}}`
+
+- Specify a minimum Mutation Score Indicator (MSI):
+
+`infection --min-msi {{percentage}}`
+
+- Specify a minimum covered code MSI:
+
+`infection --min-covered-msi {{percentage}}`
+
+- Use a specific test framework (defaults to phpunit):
+
+`infection --test-framework {{phpunit|phpspec}}`
+
+- Only mutate lines of code that are covered by tests:
+
+`infection --only-covered`
+
+- Display the mutation code that has been applied:
+
+`infection --show-mutations`
+
+- Specify the log verbosity:
+
+`infection --log-verbosity {{default|all|none}}`