Updating release notes for pg_stat_monitor 2.0.0 release

RELEASE_NOTES.md

@@ -2,6 +2,41 @@
 
 Below is the complete list of release notes for every version of ``pg_stat_monitor``.
 
+## 2.0.0
+
+### Improvements
+
+[PG-310](https://jira.percona.com/browse/PG-310): Bucket is “Done” vs still being current/last 
+[PG-400](https://jira.percona.com/browse/PG-400): Add timezone in datetime columns in pg_stat_monitor view.
+[PG-435](https://jira.percona.com/browse/PG-435): PostgreSQL 15 Support by adding newly introduced columns
+[PG-488](https://jira.percona.com/browse/PG-488): Update query buffer overflow management to use dynamic shared memory
+[PG-543](https://jira.percona.com/browse/PG-543): PostgreSQL's pg_stat_statements compatible view. 
+[PG-545](https://jira.percona.com/browse/PG-545): Same query text should generate same queryid
+[PG-569](https://jira.percona.com/browse/PG-569): Make all data types of pg_stat_monitor view compatible with pg_stat_statements
+[PG-586](https://jira.percona.com/browse/PG-586): CPU and user timing should be captured for utility statements as well
+[PG-588](https://jira.percona.com/browse/PG-588): Fix missing query and query normalization issue; rearchitect pg_stat_monitor
+[PG-606](https://jira.percona.com/browse/PG-606): New GUC required for enabling/disabling of pgsm_query_id calculation
+[PG-607](https://jira.percona.com/browse/PG-607): Allow histogram to track queries in sub-ms time brackets
+                                
+### Bug Fixes
+
+[PG-265](https://jira.percona.com/browse/PG-265): Make cpu_user_time and cpu_sys_time cumulative.
+[PG-306](https://jira.percona.com/browse/PG-306): bucket_start_time - TEXT vs TIMESTAMP? 
+[PG-320](https://jira.percona.com/browse/PG-320): Remove state/state_code fields from pg_stat_monitor_view.
+[PG-354](https://jira.percona.com/browse/PG-354): Remove pg_stat_monitor_settings view
+[PG-373](https://jira.percona.com/browse/PG-373): Remove wal fields for PG12 and below
+[PG-518](https://jira.percona.com/browse/PG-518): Internal Functions should NOT be visible in PGSM API. 
+[PG-552](https://jira.percona.com/browse/PG-552): Column names not correct for PG-12 & 11 on PGSM main branch. 
+[PG-579](https://jira.percona.com/browse/PG-579): Querying pg_stat_monitor view crashes the server when pg_stat_monitor.so is not configured in shared_preload_libraries
+[PG-582](https://jira.percona.com/browse/PG-582): blk_read_time and blk_write_time are not being rounded. 
+[PG-583](https://jira.percona.com/browse/PG-583): Rounded time based values are not consistent  
+[PG-591](https://jira.percona.com/browse/PG-591): cpu_sys_time is not rounded off intermittently. 
+[PG-593](https://jira.percona.com/browse/PG-593): min_exec_time should not be 0
+[PG-594](https://jira.percona.com/browse/PG-594): PG-13 *_exec_times now being rounded off. 
+[PG-597](https://jira.percona.com/browse/PG-597): Remove rounding off for floating point values
+[PG-601](https://jira.percona.com/browse/PG-601): Histogram ranges are not correct.
+[PG-605](https://jira.percona.com/browse/PG-605): Fix TAP Tests framework crash 
+
 ## 1.1.1
 
 ### Improvements