doc(wiki)[tools]: patch generator

docs/tools/Patch_generator.md

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-TODO
+# DiscoPoP patch generator
+## Executable
+`discopop_patch_generator`
+
+## Purpose
+Convert a set of parallel patterns obtained by the [DiscoPoP Explorer](../tools/Explorer.md) or [optimizer](../tools/Optimizer.md) into a structured set of applicable patch files.
+The created patches can be applied manually or via the [DiscoPoP patch applicator](../tools/Patch_applicator.md).
+
+## Required input
+- `Parallel patterns` in the form of a `JSON` file
+
+## Output
+The created patches will be stored in a folder named `.discopop/patch_generator`.
+Within this folder, individual folders for each parallel pattern will be created. Their `id` will act as the folders name.
+Within these inner folders, patch files for all modified `file-id` are created.
+Please refer to [Filemapping](../data/Filemapping.md) for information how to interpre the used `file-ids`.
+
+## Note
+For a more detailed description of the available run-time arguments, please refer to the help string of the respective tool.
+```
+discopop_patch_generator --help
+```