Add FAQ

Author: khvzak

Diff for: FAQ.md

@@ -0,0 +1,21 @@
+# mlua FAQ
+
+This file is for general questions that don't fit into the README or crate docs.
+
+## Loading a C module fails with error `undefined symbol: lua_xxx`. How to fix?
+
+Add the following rustflags to your [.cargo/config](http://doc.crates.io/config.html) in order to properly export Lua symbols:
+
+```toml
+[target.x86_64-unknown-linux-gnu]
+rustflags = ["-C", "link-args=-rdynamic"]
+
+[target.x86_64-apple-darwin]
+rustflags = ["-C", "link-args=-rdynamic"]
+```
+
+## I want to add support for a Lua VM fork to mlua. Do you accept pull requests?
+
+Adding new feature flag to support a Lua VM fork is a major step that requires huge effort to maintain it.
+Regular updates, testing, checking compatibility, etc.
+That's why I don't plan to support new Lua VM forks or other languages in mlua.

Diff for: README.md

@@ -11,7 +11,11 @@
 [codecov.io]: https://codecov.io/gh/khvzak/mlua
 [MSRV]: https://img.shields.io/badge/rust-1.56+-brightgreen.svg?&logo=rust
 
-[Guided Tour](examples/guided_tour.rs)
+[Guided Tour] | [Benchmarks] | [FAQ]
+
+[Guided Tour]: examples/guided_tour.rs
+[Benchmarks]: https://github.com/khvzak/script-bench-rs
+[FAQ]: FAQ.md
 
 `mlua` is bindings to [Lua](https://www.lua.org) programming language for Rust with a goal to provide
 _safe_ (as far as it's possible), high level, easy to use, practical and flexible API.