Optimize code

Signed-off-by: Jianhui Zhao <jianhuizhao329@gmail.com>

README.md

@@ -98,7 +98,7 @@ int main(int argc, char **argv)
         goto done;
 #endif
 
-    uh_add_action(srv, "/hello", hello_action);
+    srv->add_action(srv, "/hello", hello_action);
     
     uloop_run();
 done:

README_ZH.md

@@ -99,7 +99,7 @@ int main(int argc, char **argv)
         goto done;
 #endif
 
-    uh_add_action(srv, "/hello", hello_action);
+    srv->add_action(srv, "/hello", hello_action);
     
     uloop_run();
 done:

example/helloworld.c

@@ -54,7 +54,7 @@ int main(int argc, char **argv)
         goto done;
 #endif
 
-    uh_add_action(srv, "/hello", hello_action);
+    srv->add_action(srv, "/hello", hello_action);
     
     uloop_run();
 done:

src/uhttpd.c

@@ -87,6 +87,7 @@ struct uh_server *uh_server_new(const char *host, const char *port)
     srv->free = uh_server_free;
     srv->set_docroot = uh_set_docroot;
     srv->set_index_file = uh_set_index_file;
+    srv->add_action = uh_add_action;
 
 #if (UHTTPD_SSL_SUPPORT)
     srv->ssl_init = uh_ssl_init;

src/uhttpd.h

@@ -34,6 +34,7 @@ struct uh_server {
     void (*set_docroot)(struct uh_server *srv, const char *docroot);
     void (*set_index_file)(struct uh_server *srv, const char *index_file);
     void (*error404_cb)(struct uh_client *cl);
+    int (*add_action)(struct uh_server *srv, const char *path, action_cb_t cb);
 
 #if (UHTTPD_SSL_SUPPORT)
     int (*ssl_init)(struct uh_server *srv, const char *key, const char *crt);