Update documentation and composer file with correct git repo Homepage

The correct place is at the EGRA github org, reference original in
the description.

Update the require part for the composer json file with this new information

ReadMe.md

@@ -1,6 +1,6 @@
 # Composer package from Smarty Extended
 
-This is an updated package for smarty\smarty
+This is an updated package for [smarty\smarty](https://github.com/smarty-php/smarty/)
 
 Adds:
 
@@ -20,6 +20,9 @@ composer config repositories.git.egplusww.jp.Composer composer https://git.egplu
 Alternative setup composer local zip file repot:
 `composer config repositories.composer.egplusww.jp composer http://composer.egplusww.jp`
 
+> [!notice]
+> Requires mbstring extension installed, will not use the symfony/polyfill-mbstring
+
 ## Install package
 
 `composer require egrajp/smarty-extended:^5`

composer.json

@@ -1,11 +1,11 @@
 {
     "name": "egrajp/smarty-extended",
-    "description": "Smarty, extended with gettext, checkbox/radio labels and index numbers",
+    "description": "Smarty, extended with gettext, checkbox/radio labels and index numbers. Based on the smarty project: https://github.com/smarty-php/smarty/",
     "type": "library",
     "keywords": [
         "templating"
     ],
-    "homepage": "https://github.com/smarty-php/smarty/",
+    "homepage": "https://github.com/TBWA-EGPlus-Japan/Composer.smarty-extended",
     "license": "LGPL-3.0",
     "autoload": {
         "files": [
@@ -28,7 +28,11 @@
             "url": "https://git.egplusww.jp/api/packages/Composer/composer"
         }
     },
+    "require": {
+        "php": "^7.4 || ^8.0",
+        "ext-mbstring": "*"
+    },
     "require-dev": {
-        "egrajp/corelibs-composer-all": "^9.13"
+        "egrajp/corelibs-composer-all": "^9"
     }
 }