chore: update readme

README.md

@@ -4,3 +4,71 @@
 > Work in progress. This is not finished at all, I'm just experimenting.
 
 Meta Programming Header Only Library for C
+
+## Current limitations
+
+- Only parses `typedef struct { ... } type_name;`
+- Will generate colliding definitions in case of types with the same name
+- Requires `stb_c_lexer`
+
+## Quick start
+
+Current implementation depends on `stb_c_lexer`, in future I'll use my own lexer. Because of the current setup, cmeta is not easy to use, remember, it's not finished!
+
+1. Create `main.c`
+
+```c
+typedef struct { 
+    int int_field;
+    const char *char_ptr_field;
+} My_Struct;
+
+int main(void) {
+    return 0;
+}
+```
+
+2. Create `cmeta.c`
+
+You only have to call `process_file` with a file to generate type infos etc in `cmeta.h`.
+
+```c
+#define CMETA_COMPTIME
+#include "cmeta.h"
+
+int main(void) {
+    if (!process_file("./main.c")) return 1;
+
+    return 0;
+}
+```
+
+3. Build and cmeta
+
+As mentionned before, `stb_c_lexer` is currently required, it will be removed in the future.
+
+```console
+$ gcc cmeta.c -I./third_party/ -o cmeta
+$ ./cmeta
+```
+
+4. Enjoy!
+
+You can now inspect your types!
+
+```c
+#include "cmeta.h"
+
+typedef struct { 
+    int int_field;
+    const char* char_field;
+} My_Struct;
+
+int main(void) {
+    printf("My_Struct.name = %s\n", my_struct_info.name);
+    printf("My_Struct.fields_count = %zu\n", my_struct_info.fields_count);
+    return 0;
+}
+```
+
+It runs `gcc -E`, so it process everything your code uses, including structs from cmeta itself.