Adding new collection folder (#4216)

src/contrib/collection/README.md

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+# Centren Collection modes
+Centreon developed a method to scrap monitoring indicators, and It’s called **Collection**.
+
+This kind of mode is handy if you are in one of the following situations:
+* You can't find an existing plugin to monitor what you want or fulfill your particular need.
+* You need to gather data from a in-house, black box, or third-party application and transform it to be easier to analyze.
+* Writing (or asking for) a dedicated plugin appears overkill because you simply want to monitor values and apply thresholds over them.
+
+You can find more information on [The Watch](https://thewatch.centreon.com/data-collection-6/centreon-plugins-discover-collection-modes-131), the Centreon User Community.
+
+Currently, Collection modes are available for:
+* SNMP (check the [tutorial](https://thewatch.centreon.com/product-how-to-21/snmp-collection-tutorial-132))
+* SQL (check the [tutorial](https://thewatch.centreon.com/product-how-to-21/sql-collection-tutorial-134))
+
+Feel free to share here the file that you have developed.
+
+* SNMP
+  * [moxa-iologik-collection.json](snmp/moxa-iologik-collection.json): to monitor the DI channel status (OID [diStatus](http://www.circitor.fr/Mibs/Html/M/MOXA-IO-E2210-MIB.php#DiEntry)  .1.3.6.1.4.1.8691.10.2210.10.1.1.4 of MOXA ioLogik device

src/contrib/collection/snmp/moxa-iologik-collection.json

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+{
+    "mapping": {
+        "diStatus": {
+            "0": "Off",
+            "1": "On"
+        }
+    },
+    "constants": {
+        "criticalStatus": "Off"
+    },
+    "snmp": {
+        "tables": [
+            {
+                "name": "diEntry",
+                "oid": ".1.3.6.1.4.1.8691.10.2210.10.1.1",
+                "used_instance": "\\.(\\d+)$",
+                "entries": [
+                    { "name": "diIndex", "oid": ".1.3.6.1.4.1.8691.10.2210.10.1.1.1"},
+                    { "name": "diStatus", "oid": ".1.3.6.1.4.1.8691.10.2210.10.1.1.4" , "map": "diStatus"}
+                ]
+            }
+        ]		
+    },
+    "selection_loop": [
+        {
+            "name": "DI Channel identification",
+            "source": "%(snmp.tables.diEntry)",
+            "expand_tables": {
+                "diEntry": "%(snmp.tables.diEntry.[%(diEntry.instance)])"
+            },
+            "critical": "%(diEntry.diStatus) =~ /%(constants.criticalStatus)/",
+            "formatting": {
+                "printf_msg": "Device '%s' status is '%s'",
+                "printf_var": [
+                    "%(diEntry.diIndex)",
+                    "%(diEntry.diStatus)"
+                ],
+                "display_ok": true
+            }
+        }
+    ],
+    "formatting": {
+        "custom_message_global": "All DI Channels are OK",
+        "separator": "-"
+    }
+}