feat: load conf file

mygr.sh

@@ -4,7 +4,10 @@
 readonly CONFIG_FILE='.mygr_config'
 
 load_config() {
-  if [[ ! -e ${CONFIG_FILE} ]]; then
+  if [[ -e ${CONFIG_FILE} ]]; then
+    # shellcheck disable=SC1090
+    source ${CONFIG_FILE}
+  else
     create_config
   fi
 }