add enemy SOP

pets-lib/sop/enemies.md

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+# Enemies
+
+## Rust Types
+
+// TODO
+
+## Adding Enemies
+
+- Add a new entry to the `EnemyID` enum in the GDExtension.
+- Open the "Walking Enemy" scene and select the animated sprite.
+- Add an idle animation and name it "xxx-Idle" where xxx is the ID of the enemy.
+- Add another one named "xxx-Run" for the running animation.
+
+### If adding the enemy into a room:
+
+- Open the room scene and add a new Walking Enemy instance.
+- Set its `enemy_id` field accordingly.

pets-lib/sop/index.md

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+# Standard Operating Procedures
+
+This set of markdown files is a collection of instructions for how to do basic
+stuff done in development of the game. It's meant for both my future self and
+also new contributors who are confused on where to start.
+
+## Table of Contents
+
+- [Enemies](enemies.md)