Create read-only-environment.md

rfcs/read-only-environment.md

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+# Read-Only Environment
+
+## Summary
+
+Add a way to access a read-only version of the environment without disabling `safeenv`.
+
+## Motivation
+
+There are valid use cases for accessing the environment in a read-only way. As defined in the [RFC](https://github.com/Roblox/luau/blob/master/rfcs/deprecate-getfenv-setfenv.md) for deprecating 
+getfenv and setfenv there are outlined cases where reading the environment is useful.
+
+Increased performance can be achieved for transpilers written in Luau that may not be able to have a static environment created to access functions from or cant directly transpile 1:1. Similarly
+interpreters written in Luau can benefit from being able to access functions without deoptimization, making other optimizations still active.
+
+...
+
+## Design
+
+...
+
+## Drawbacks
+
+...
+
+## Alternatives
+
+...