Fetch Top 5 CIs with most number of Open Incidents along with the count (#2115)

* Create README.md

* Create getCIwithmostActiveInc.js

Author: Soumyadeep10

Core ServiceNow APIs/GlideAggregate/Get top 5 CIs with most number of Open Incidents/README.md

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+Use-case:
+**Fetch Top 5 CIs with the most number of Open Incidents along with the count**
+
+Type of Script writted: **Background Script**
+
+**How the code works:**
+The code uses the GlideAggregate API to efficiently calculate and retrieve the results -
+1. A GlideAggregate query is initiated on the Incident table. The query is restricted to only active Incidents.
+2. The query instructs the database to COUNT records grouped by the configuration item(cmdb_ci).
+3. Furthermore, the records are instructed to be in descending order of number of incidents related to one CI, also a limit
+   of 5 records are applied to be fetched.
+4. The query is executed and a loop is iterated over these 5 records to fetch and print
+   the CI name and its corresponding incident count.

Core ServiceNow APIs/GlideAggregate/Get top 5 CIs with most number of Open Incidents/getCIwithmostActiveInc.js

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+var countOfCI = 5;
+var inc = new GlideAggregate('incident');
+inc.addActiveQuery();
+inc.addAggregate('COUNT', 'cmdb_ci');
+inc.groupBy('cmdb_ci');
+inc.orderByAggregate('COUNT', 'cmdb_ci');
+inc.setLimit(countOfCI);
+inc.query();
+gs.info('---Top ' + countOfCI + ' CIs with Most Open Incidents---');
+
+
+while (inc.next()) {
+    var ciName;
+    var ciSysID = inc.cmdb_ci;
+    var count = inc.getAggregate('COUNT', 'cmdb_ci');
+    var ci = new GlideRecord('cmdb_ci');
+    if (ci.get(ciSysID)) {                  //retrieving the CI record
+        ciName = ci.name.toString();
+    } else {
+        ciName = 'Invalid CI';
+    }
+
+    gs.info('. CI: ' + ciName + ' | Count of Inc: ' + count);
+}