Add readme

README.md

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+# Create patch
+* `diff -ruN path/to/original.file patch/to/changed.file` > patch.patch
+* Open resulting patch and change header
+** `--- a/path/file.extension`
+** `+++ b/path/file.extension`
+
+# PKGBUILD changes
+* Add to `source` array
+* Add to checksum array (`'SKIP'`)
+* Add applying of patch to `build()`/`prepare()`
+** `patch -p1 -i ../patch.patch`