Create README.md

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.