completed documentation

README.md

 ## Description
 
-This role installs, enables and configures the PHP module `<module>`.
+This role installs, enables and configures the PHP module `apcu`.
 
 ## Requirements
 
 ### Variables
 
+* php_mod_apcu_enabled
+  * description:
+    * This option enables or disables the APC.
+  * choices: [false, true]
+  * default: true
+
+* php_mod_apcu_shm_segments
+  * description:
+    * This option specifies the number of shared memory segments to allocate for the compiler cache.
+  * default: 1
+
+* php_mod_apcu_shm_size
+  * description:
+    * This option specifies the size of each shared memory segment given.
+  * default: "32M"
+
+* php_mod_apcu_entries_hint
+  * description:
+    * This option specifies a "hint" about the number of distinct variables that might be stored.
+  * default: 4096
+
+* php_mod_apcu_ttl
+  * description:
+    * This option specifies the number of seconds a cache entry is allowed to idle in a slot in case this cache entry slot is needed by another entry.
+  * default: 0
+
+* php_mod_apcu_gc_ttl
+  * description:
+    * This option specifies the number of seconds that a cache entry may remain on the garbage-collection list.
+  * default: 3600
+
+* php_mod_apcu_mmap_file_mask
+  * description:
+    * This option specifies the mktemp-style file_mask to pass to the mmap module for determining whether your mmap'ed memory region is going to be file-backed or shared memory backed.  
+  * default: ""
+
+* php_mod_apcu_slam_defense
+  * description:
+    * This option sets the percentage of processes that will skip trying to cache an uncached file.
+    * Setting this to 0 disables this feature.
+    * Setting this to 75 would mean that there is a 75% chance that the process will not cache an uncached file.
+  * default: 1
+
+* php_mod_apcu_enable_cli
+  * description:
+    * This option enables the APC for the CLI version of PHP.
+  * choices: [false, true]
+  * default: false
+
+* php_mod_apcu_use_request_time
+  * description:
+    * This option specifies the use of the SAPI request start time for TTL.  
+  * choices: [false, true]
+  * default: false
+
+* php_mod_apcu_serializer
+  * description:
+    * This option is used to configure APC to use a third party serializer.
+  * default: "php"
+
+* php_mod_apcu_coredump_unmap
+  * description:
+    * This option enables APC handling of signals, such as SIGSEGV, that write core files when signaled.
+  * choices: [false, true]
+  * default: false
+
+* php_mod_apcu_preload_path
+  * description:
+    * This option set a path to the directory that APC will load cache data at startup.
+  * default: ""
+
 ## Processes
 
 None