feat: add QnA

Author: Denloob

README.md

@@ -55,6 +55,44 @@ The macros are documented in the [header file](./smartptr.h)
 Copy [smartptr.h](./smartptr.h) into your project and `#include` it. That's it!
 Make sure you are using `gcc`, although other compilers might work too.
 
+## QnA
+
+#### **Q: I compile with gcc but use `clangd` for static analysis. Will this library break clang?**
+
+A: You can easily allow the library to "do nothing" if it detects a non compatible compiler (like clang). \
+Thus clang (or any other compiler) analyzer will not break, and the gcc-compiled
+code will still work as intended. \
+To do this, open the header, and in the beginning, find
+```c
+// If you wish, you may enable for clang or any other non-gnu compiler to completely
+// ignore most* smartptr/defer statements. This can be useful for example if you
+// are using it as an LSP (like clangd).
+// * - non-special features like smartptr_func_ptr or smartptr will still work
+#if (!defined(__GNUC__) || defined(__clang__))
+
+#if 0
+#define smartptr__setting_DO_NOTHING_SPECIAL
+#else
+#error "Unsupported compiler"
+#endif
+
+#endif
+```
+Now, switch the `#if 0` to `#if 1`. \
+That's it!
+
+#### **Q: I am writing in a non-libc environment and `stdlib`/`free` breaks my compiling/linking**
+
+A: The easiest solution is to completely disable smartptr__free. Open the header and locate
+```c
+// If you do not wish to have a macro `smartptr` that calls free
+// (for example if you don't have libc, remove the following define)
+#define smartptr__setting_SUPPORT_FREE
+```
+somewhere in the beginning of the file. Now simply remove the `#define` line and
+you are good to go! \
+All of the other smartptr and defer features will work as intended.
+
 ## Contributing
 Contributions are welcome! Open an Issue or a PR with your questions/suggestions.