Fixed moodle ci issue and updated README file

Author: santoshndev

.github/workflows/ci.yml

@@ -8,7 +8,7 @@ jobs:
 
     services:
       postgres:
-        image: postgres:13
+        image: postgres:14
         env:
           POSTGRES_USER: 'postgres'
           POSTGRES_HOST_AUTH_METHOD: 'trust'

README.md

@@ -1,16 +1,25 @@
-# Site Statistics
-Site Statistics Block for Moodle
-
-This block is generally used to show the site statistics such as total number of active users, courses, activities and disk usage on dashboard.
-
-This block can be added & viewed by administrator and manager role. Other user roles can also view this block if they are allowed to view it.
-
-This block provides shortcuts to user management, course management and activity management through the hyperlinks added to the counts.
-
-This block comes with English, Marathi and Hindi language strings.
-
-# #Author
-
-Author: Santosh Nagargoje
-
-Web profile: https://santoshnagargoje.in/
+# Site Statistics
+Site Statistics Block for Moodle
+
+This block is generally used to show the site statistics such as total number of active users, courses, activities and disk usage on dashboard.
+
+This block can be added & viewed by administrator and manager role. Other user roles can also view this block if they are allowed to view it.
+
+This block provides shortcuts to user management, course management and activity management through the hyperlinks added to the counts.
+
+This block comes with English, Marathi and Hindi language strings.
+
+# How to use
+1. Login as an administrator.
+2. Go to Dashboard page.
+3. Turn Editing on
+4. Click on Add a block
+5. Select Site Statistics from the list
+6. Check block added on Dashboard page
+**Note**: In order to get the disk usage value, the **Calculate Disk Usage** task should be executed. By default, it's scheduled on midnight every day but you are free to reschedule it as per your requirement.
+
+# Author
+
+Santosh Nagargoje
+
+Web profile: https://santoshnagargoje.in/