[docs] new folder knowledge library added

docs/user/setup/docs.user.setup.cost_centers.md

@@ -23,6 +23,9 @@ You may not have shipping expenses for your walk-in customers, and no shop-rent
 
 Thus when you do your analysis you get a better understanding as to which side of your business is doing better. Since ERPNext has an option to add multiple Companies, you can create Cost Centers for each Company and manage it separately.
 
+To understand chart of cost centers in detail visit [Accounting Knowledge](docs.user.knowledge.accounting.html)
+
+
 ### Chart of Cost Centers
 
 To setup your Chart of Cost Centers go to:

docs/user/setup/docs.user.setup.first.md

@@ -11,7 +11,7 @@ This form will create your first **Company** and **Fiscal Year** (accounting or
 
 Some definitions:
 
-- Fiscal Year: This is your financial year, the fiscal year usually starts on 1st Jan or 1st March for most regions. If you are not sure, consult an accountant.
+- [Fiscal Year](docs.user.knowledge.fiscal_year.html): This is your financial year, the fiscal year usually starts on 1st Jan or 1st March for most regions. If you are not sure, consult an accountant.
 - Abbreviation: In a multi-company setup, the abbreviation is appended to each account, so keep it small (2-4) characters and all caps.
 
 This will also set the default **Currency** and time zone for your account. Once you complete this, your first **Company** and **Chart of Accounts** will be created.

docs/user/setup/docs.user.setup.taxes.md

@@ -7,7 +7,14 @@ One of the primary motivator for compulsory use of accounting tools is calculati
 
 ### Tax Accounts
 
-For Tax Accounts that you want to use in the tax templates, you must mention them as type “Tax” in your Chart of Accounts.
+For Tax Accounts that you want to use in the tax templates, you must mention them as type “Tax” in your Chart of Accounts. Some Item-tax features are given below :
+
+- **Discount**: The maximum Discount that can be applied on an Item can be fixed in the Item master. Read [Discount](docs.user.selling.discount.html)
+- **Inclusive and Exclusive Tax**: ERPNext allows you to enter Item rates which are tax inclusive.
+- **Flat Discount**: This feature will be added soon.
+- **Exception to the rule**: Item tax settings are required only if a particular Item has a different tax rate than the rate defined in the standard tax Account
+
+
 
 ## Sales Taxes and Charges Master