added doc for create job

docs/source/reference/evaql/create_job.rst

@@ -0,0 +1,40 @@
+CREATE JOB
+===============
+
+.. _create-function:
+
+The CREATE JOB statement allows us to create recurring or one-time jobs in EvaDB. These jobs can be associated with multiple queries, 
+all of which will be executed sequentially every time the created job is triggered according to the assigned schedule.
+
+
+.. code-block:: sql
+
+    CREATE JOB [IF NOT EXISTS] <job_name> AS {
+        <job_queries>...
+    }
+    [START <start_time>]
+    [END <end_time>]
+    [EVERY <repeat_period> <repeat_unit>]
+
+* There can be multiple queries defined per job.
+* The START parameter denotes the first trigger time of the job. The default value is the job creation time.
+* The END parameter denotes the last trigger time of the job. The job becomes inactive after this time. If no end value is provided, a recurring job never ends.
+* The EVERY parameter can be used to specify the repeat frequency of the jobs. The repeat period is expected to be a positive integer, and accepted values for the repeat unit are "minute", "minutes", "min", "hour", "hours", "day", "days", "week", "weeks", "month", "months".
+
+
+Examples
+~~~~~~~~
+
+.. code:: text
+
+    CREATE JOB forecasting_job AS {
+        CREATE OR REPLACE FUNCTION HomeSalesForecast FROM
+            ( SELECT * FROM postgres_data.home_sales )
+        TYPE Forecasting
+        PREDICT 'price';
+        SELECT HomeSalesForecast(10);
+    }
+    START '2023-04-01 01:10:00'
+    END '2023-05-01'
+    EVERY 1 week;
+