Add README

README.md

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+
+# Namespaces in C
+
+In C you can create pseudo-namespaces by abusing structs of function
+pointers, making function calls look like `module.func(x)` instead of
+`func(x)`.
+
+A lot of people online spout that this creates overhead, but this should
+show that clang>=15.0.7 will still inline such function calls. GCC 11.3.1
+is unable  to inline the function, but will still call the function
+directly.
+
+## Build
+```sh
+./build.sh
+```
+
+## Verify code
+```
+./build/main
+```
+
+## Check disassembly
+```
+less dump.asm
+```