Add README for incident count snippet

Added comprehensive README documentation for the incident count snippet with usage examples and API references

Author: rishanmenezes

Core ServiceNow APIs/GlideRecord/IncidentCount/README.md

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+# Incident Count
+
+## Description
+This snippet demonstrates how to count the total number of incident records in ServiceNow using the GlideRecord API.
+
+## Usage
+This code can be run in:
+- Background Scripts
+- Script Includes
+- Business Rules
+- Scheduled Jobs
+
+## Code Example
+```javascript
+var gr = new GlideRecord('incident');
+gr.query();
+var count = gr.getRowCount();
+gs.info('Total number of incidents: ' + count);
+```
+
+## API Used
+- GlideRecord - Core ServiceNow API for database operations
+- getRowCount() - Returns the number of rows in the query result
+
+## Notes
+- This snippet uses getRowCount() which is efficient for counting records
+- The query() method must be called before getRowCount()
+- You can add encoded queries before calling query() to count specific records
+
+## Related
+- [GlideRecord Documentation](https://developer.servicenow.com/dev.do#!/reference/api/latest/server/no-namespace/c_GlideRecordScopedAPI)
+
+## Tags
+#GlideRecord #Incidents #Count #ServerSide