[docs] Customize links added

docs/user/customer_portal/docs.user.customer_portal.login.md

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+---
+{
+	"_label": "Login"
+}
+---
+To login into the customer account, use the customer email id and the password sent by ERPNext, generated by the sign-up process.
+
+![Login](img/customer-portal-login.png)

docs/user/customer_portal/docs.user.customer_portal.md

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+---
+{
+	"_label": "Customer Portal",
+	"_toc": [
+		"docs.user.customer_portal.sign_up",
+		"docs.user.customer_portal.login"
+	]
+}
+---
+
+Customer Portal is designed to give easy accesibility to customers of a company.
+
+
+

docs/user/customer_portal/docs.user.customer_portal.orders.md

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+---
+{
+	"_label": "Customer Orders"
+}
+---
+
+ERPNext Web Portal gives your customers quick access to their Orders. Customers can check the status of their orders by logging on to the web.
+
+Once an order is raised, either using the Shopping Cart or from within ERPNext, your customer can view the order and keep an eye on the billing and shipment status. When the invoice and payment against these orders are submitted, the customer can see the updated status on the portal, at a glance. 
+
+
+![Customer Portal](img/customer-portal-orders-1.png)
+

docs/user/customer_portal/docs.user.customer_portal.sign_up.md

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+---
+{
+	"_label": "Sign-Up"
+}
+---
+Customers have to log-in to the Company Website,and sign-up as a customer. 
+
+#### Step 1: Click on Login Icon 
+
+![Sign Up](img/customer-portal-sign-up-1.png)
+
+<br>
+
+#### Step 2: Click on Sign Up Icon
+
+![Sign Up](img/customer-portal-sign-up-2.png)
+
+<br>
+
+#### Step 3: Enter Customer Name and ID
+
+![Sign Up](img/customer-portal-sign-up-3.png)
+
+After the sign up process, a mail will be sent to the customers email id with the password details.
+