feat: add example

README.md

@@ -1,6 +1,50 @@
 # pHash.c
 a perceptual image dct hashing library to compare image similarity
 
+## Usage
+
+```c
+#include "pHash.h"
+#include <stdio.h>
+
+int main() {
+    PhashError err;
+    PhashImage *img = NULL;
+    uint64_t hash;
+
+    // Initialize library
+    if ((err = phash_initialize()) != PHASH_OK) {
+        printf("Error: %s\n", phash_error_string(err));
+        return 1;
+    }
+
+    // Create a simple image (replace with your image loading code)
+    const int width = 100, height = 100;
+    unsigned char* data = malloc(width * height * 3);
+    // Fill image data here...
+
+    // Create image object
+    if ((err = phash_image_create(data, width, height, 3, 1, &img)) != PHASH_OK) {
+        printf("Error: %s\n", phash_error_string(err));
+        free(data);
+        return 1;
+    }
+
+    // Compute hash
+    if ((err = phash_compute(img, NULL, &hash)) != PHASH_OK) {
+        printf("Error: %s\n", phash_error_string(err));
+    } else {
+        printf("Hash: %016lx\n", hash);
+    }
+
+    // Cleanup
+    free(data);
+    phash_image_destroy(img);
+    phash_terminate();
+    return 0;
+}
+```
+
 ## Build 
 
 ```bash 

main.c

@@ -89,4 +89,4 @@ int main() {
     phash_terminate();
 
     return 0;
-}
+}