Cyborg module guidelines + whitelisted Cyborg hands

src/en/space-station-14/departments/silicon/proposals/silicon_hand_whitelist.md

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+# Cyborg Whitelisted 'Hands'
+
+| Designers  | Implemented | GitHub Links                                                              |
+|------------|-------------|---------------------------------------------------------------------------|
+| ThatGuyUSA | YES         | [PR #38668](https://github.com/space-wizards/space-station-14/pull/38668) |
+
+## What are whitelisted Cyborg 'hand' slots?
+
+Whitelisted hand slots are the solution to future proofing Cyborg inventories.
+
+Essentially it is a traditional 'hand' you would find on a humanoid, that can only hold items of the corresponding tag or component that we tell it to.
+
+## Before its implementation
+
+Cyborgs were given 'empty stack' prototypes that could exclusively hold the item assigned to it.
+
+Before [PR #38668](https://github.com/space-wizards/space-station-14/pull/38668), Cyborgs were given slots that could only hold one specific item, indicated by a silhouette of that item. It had a shortcoming of scaling terribly, making for a poor user experience the more 'hands' someone had to interface with in a single module.
+
+If a Cyborg wanted to hold reinforced uranium glass, a `reinforced uranium glass hand` would have been created to be placed into a module. While it accomplished what we needed, it would a huge commitment for an uncommon material that one might not even interact with in most rounds.
+
+Due to how Cyborgs navigate their inventory, swapping between larger lists of slots and tools can become tedious quickly leading to a diminished user experience.
+
+## Implementation
+
+Whitelisted Cyborg 'hands' aim to generalize things a cyborg can hold utilizing Tags and Components, while still limiting their freedom.
+
+Instead of having one slot each for gauze, bruise packs, and ointment, you have 3 slots that can hold any topical medication. If someone wants to exclusively stack up on gauze and blood packs, they may do so as they please.
+
+This allows the Cyborg player to fill their inventory to better suit their needs, while maintaining the restrictions of whatever module the hand is part of.
+
+## What a whitelisted 'hand' slot IS:
+
+- A way to compliment and empower Cyborg's embedded toolkit.
+
+- A way to condense cluttered modules by merging redundant slots together.
+
+## What a whitelisted 'hand' slot ISN'T:
+
+- A fully identical, normal hand but on a Cyborg instead.
+
+- A shortcut to alleviate or negate a Cyborg's inventory restrictions.