Created Transaction Rules (markdown)

Transaction-Rules.md

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+### Transaction Rules
+
+Transaction Rules are a powerful feature in WYGIWYH that allow for automatic modification of transactions based on specified criteria. This can save time and ensure consistency in your financial tracking.
+
+Key Aspects of Transaction Rules:
+
+* **Conditions**: Set specific criteria that a transaction must meet for the rule to apply. This can include attributes like description, amount, account, etc.
+* **Actions**: Define what changes should be made to a transaction when the conditions are met. This can include setting categories, tags, or modifying other fields.
+* **Activation Options**: Rules can be set to apply when transactions are created, updated, or both.
+
+#### Actions and Conditions
+
+When creating a new rule, you will need to add a Condition and, later, Actions.
+
+Both use a limited subset of Python, via [SimpleEval](https://github.com/danthedeckie/simpleeval).
+
+The Condition must evaluate to True or False, and the Action must evaluate to a value that will be set on the selected field.
+
+You may use any of the available [variables](#available-variables) and [functions](#available-functions).
+
+#### Available variables
+
+* `account_name`
+* `account_id`
+* `account_group_name`
+* `account_group_id`
+* `is_asset_account`
+* `is_archived_account`
+* `category_name`
+* `category_id`
+* `tag_names`
+* `tag_ids`
+* `entities_names`
+* `entities_ids`
+* `is_expense`
+* `is_income`
+* `is_paid`
+* `description`
+* `amount`
+* `notes`
+* `date`
+* `reference_date`
+
+#### Available functions
+
+* `relativedelta`
+
+#### Examples
+
+Add a tag to an income transaction if it happens in a specific account
+
+```
+If...
+account_name == "My Investing Account" and is_income
+
+Then...
+Set Tags to
+tag_names + ["Yield"]
+```
+
+---
+
+Move credit card transactions to next month when they happen at a cutoff date
+
+```
+If...
+account_name == "My credit card" and date.day >= 26 and reference_date.month == date.month
+
+Then...
+Set Reference Date to
+reference_date + relativedelta(months=1)).replace(day=1)
+```