Added correct compile_flags.txt for clangd to work

compile_flags.txt

@@ -0,0 +1,22 @@
+-I third_party/nugget/psyqo-lua/../third_party/psxlua/src
+-D LUA_TARGET_PSX
+-I third_party/nugget/psyqo/../third_party/EASTL/include
+-I third_party/nugget/psyqo/../third_party/EABase/include/Common
+-I third_party/nugget/
+-ffunction-sections
+-fdata-sections
+-fomit-frame-pointer
+-fno-builtin
+-fno-strict-aliasing
+-Wno-attributes
+-march=mips1
+-EL
+-fno-pic
+-fno-stack-protector
+-nostdlib
+-ffreestanding
+-g
+-Os
+-std=c++20
+-fno-exceptions
+-fno-rtti