added variables and default values

defaults/main.yml

 ---
-php_module_config_file: "module.ini.j2"
-php_module_priority: <module prio> 
+php_module_config_file: "session.ini.j2"
+php_module_priority: 20
+php_mod_session_save_path: ""
+php_mod_session_name: "PHPSESSID"
+php_mod_session_save_handler: "files"
+php_mod_session_auto_start: false
+php_mod_session_gc_probability: 1
+php_mod_session_gc_divisor: 100
+php_mod_session_gc_maxlifetime: 1440
+php_mod_session_serialize_handler: "php"
+php_mod_session_cookie_lifetime: 0
+php_mod_session_cookie_path: "/"
+php_mod_session_cookie_domain: ""
+php_mod_session_cookie_secure: false
+php_mod_session_cookie_httponly: false
+php_mod_session_cookie_samesite: ""
+php_mod_session_use_strict_mode: false
+php_mod_session_use_cookies: true
+php_mod_session_use_only_cookies: true
+php_mod_session_referer_check: ""
+php_mod_session_cache_limiter: "nocache"
+php_mod_session_cache_expire: 180
+php_mod_session_use_trans_sid: false
+php_mod_session_trans_sid_tags: "a=href,area=href,frame=src,form="
+php_mod_session_trans_sid_hosts: ""
+php_mod_session_sid_length: 32
+php_mod_session_sid_bits_per_character: 4
+php_mod_session_upload_progress:
+  enabled: true
+  cleanup: true
+  prefix: "upload_progress_"
+  name: "PHP_SESSION_UPLOAD_PROGRESS"
+  freq: "1%"
+  min_freq: 1
+php_mod_session_lazy_write: true

vars/main.yml

 ---
-php_module_name: "<module name>"
+php_module_name: "session"