Document the qjsc compiler part of QuickJS

As pointed-out by @guest271314 in
#8 (comment).

Signed-off-by: Juan Cruz Viotti <jv@jviotti.com>

Author: jviotti

docs/existing-solutions.md

@@ -23,3 +23,12 @@ PR!](https://github.com/nodejs/single-executable/edit/main/docs/existing-solutio
 [ASAR format]: https://github.com/electron/asar
 [`@zcbenz`]: https://github.com/zcbenz
 [monkey patching of `fs` in Electron to read from an ASAR]: https://github.com/electron/electron/blob/06a00b74e817a61f20e2734d50d8eb7bc9b099f6/lib/asar/fs-wrapper.ts
+
+Miscellaneous Related Tooling
+-----------------------------
+
+| Name           | Notes                                                |  
+|----------------|------------------------------------------------------|
+| [`qjsc`][qjsc] | A JavaScript to C byte-code compiler part of QuickJS |
+
+[qjsc]: https://bellard.org/quickjs/quickjs.html#qjsc-compiler