doc(wiki)[tools]: patch applicator

docs/tools/Patch_applicator.md

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-TODO DiscoPoP Setup
+# DiscoPoP patch applicator
+## Executable
+`discopop_patch_applicator`
+
+## Purpose
+Offer the managed application, rollback, clearing and restoring of parallelism suggestions in the form of patch files created by the [patch generator](../tools/Patch_generator.md).
+
+## Required input
+- Execution mode (apply, rollback, clear, load)
+- Pattern ids to be considered
+
+## Output
+The patch applicator will not create any new output but modify the files targeted by the specified patch files in-place.
+
+
+## Note
+For a more detailed description of the available run-time arguments, please refer to the help string of the respective tool.
+```
+discopop_patch_applicator --help
+```