Update naming conventions for packages (#4003)

* Update creating-packages.md

Add a comment about capitalisation and Camel case conventions  of packages.

* Update docs/src/creating-packages.md

Co-authored-by: Ian Butterworth <[email protected]>

* Update docs/src/creating-packages.md

---------

Co-authored-by: Ian Butterworth <[email protected]>

Author: kellertuer

docs/src/creating-packages.md

@@ -620,6 +620,11 @@ may fit your package better.
        library, even without explicit affiliation with the creators of the OpenSSL (provided
        there's no copyright or trademark infringement etc.)
 
+9. Packages should follow the [Stylistic Conventions](https://docs.julialang.org/en/v1/manual/variables/#Stylistic-Conventions).
+     * The package name begin with a capital letter and word separation is shown with upper camel case
+     * Packages that provide the functionality of a project from another language should use the Julia convention
+     * Packages that [provide pre-built libraries and executables](https://docs.binarybuilder.org/stable/jll/) can keep orignal name, but should get `_jll`as a suffix. For example `pandoc_jll` wraps pandoc. However, note that the generation and release of most JLL packages is handled by the [Yggdrasil](https://github.com/JuliaPackaging/Yggdrasil) system. 
+
 ## Registering packages
 
 Once a package is ready it can be registered with the [General Registry](https://github.com/JuliaRegistries/General#registering-a-package-in-general) (see also the [FAQ](https://github.com/JuliaRegistries/General#faq)).