[docs] added ability to add static pages in docs folder and README.md in modules and doctypes

accounts/README.md

@@ -0,0 +1,13 @@
+Accounts module contains masters and transactions to manage a traditional
+double entry accounting system.
+
+Accounting heads are called "Accounts" and they can be groups in a tree like
+"Chart of Accounts"
+
+Entries are:
+
+- Journal Vouchers
+- Sales Invoice (Itemised)
+- Purchase Invoice (Itemised)
+
+All accounting entries are stored in the `General Ledger`

accounts/doctype/account/README.md

@@ -0,0 +1,11 @@
+Account DocType represents an Accounting Ledger or Group.
+
+Follows a composite model. `parent_account` represents the parent of an Account except
+a root account.
+There can be only 4 root accounts: Income, Expense, Assets and Liabilities in a company.
+
+Other features:
+
+- It can be of type Debit or Credit.
+- A Group is a collection of groups or ledgers
+

docs/docs.md

@@ -0,0 +1,11 @@
+---
+{
+	"_label": "Documentation"
+}
+---
+Welcome to the ERPNext Developer documentation.
+
+The documentation is split into two parts.
+
+- Part 1 covers the code and all functions, methods available
+- Part 2 covers all the models in the product including core models