I am beginner : Not able to solve Trailhead challange for- Data Security:Define Sharing Rules

Project custom object records should only be seen by the owner of the record and users above the owner on the role hierarchy. However, for some Project records, the Training Coordinator must also have Read Only visibility to the Project record.
Create a custom picklist field on the Project object called “Priority” with the following values: High, Medium, and Low. Then create a criteria-based Sharing Rule for Project records where the Priority = High to share those records with the Training Coordinator role.
The custom object must be named 'Project' with a resulting API name of 'Project__c'.
The Name field for 'Project' must be of type Text (not Auto-Number).
The custom object 'Project' must have a custom field of type picklist named 'Priority' with a resulting API name of 'Priority__c'.
The role label should be 'Training Coordinator' with the resulting 'Role Name' of 'Training_Coordinator'. Note that you may already have this role in your role hierarchy from a previously attempted challenge.
The sharing rule can be named anything.
The organization-wide defaults for Project cannot be set to 'Public Read/Write'.