Upload README.md and UPDATE_SOURCE.md

Author: CuriousTommy

Diff for: README.md

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+# darling-JavaScriptCore
+
+## Upstream URL
+
+https://github.com/apple-oss-distributions/JavaScriptCore/tree/JavaScriptCore-7611.3.10.1.3
+
+## Updating Source
+
+When updating the source code, make sure to refer to the [`Updating Sources`](https://docs.darlinghq.org/contributing/updating-sources/index.html#updating-sources) section from the Darling Docs website. Additional details (if any) can be found in [`darling/notes/UPDATE_SOURCE.md`](darling/notes/UPDATE_SOURCE.md).

Diff for: darling/notes/UPDATE_SOURCE.md

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+# Notes
+
+* When uploading the sources to GitHub, make sure to not include the generated `.pyc` files.
+* Make sure to execute `generate-derived-sources.sh` and `generate-unified-sources.sh` first before you execute `generate-offlineasm.sh`
+* Make sure to check/update the `generate-offlineasm.sh` script first before you execute it.