Create CONFIGURATION.md

Completed the instructions for the configuration of the module

l10n_mx_cfdi/readme/CONFIGURATION.md

@@ -0,0 +1,65 @@
+## Service Configuration
+
+Right now, this module works only with Facturama as the PAC,
+so anyone who want to make use of it needs to have an account configured in
+[Facturama](https://facturama.mx/)
+
+### Fiscal Information
+
+1. Go to Settings > Users & companies.
+
+   i. Open Mx company
+
+   ii. Mx Company information should match the same information as the one registered in Facturama, confirm the following:
+      - Name
+      - RFC / tax id number
+      - ZIP code
+      - Street & address
+      - City
+      - State
+      - Country
+
+3. In the home menu, go to Contacts
+
+   i. Search for the company name registered in the previous company configuration
+
+   ii. Open the contact form
+
+   iii. Open the Sales & purchase tab
+
+   iv. In the Fiscal information space add the following information:
+      - Fiscal regime
+      - Default CFDI usage
+      - Default payment method
+      - Default payment form
+
+5. Go to Invoicing > Configuration > CFDI > Service Configuration
+
+   i. Click **"New"** to add your _Facturama_ account
+
+   ii. "_Name"_ -> Name of the service. Name it "Facturama"
+
+   iii. _"User"_ -> Your facturama account Username
+
+   iv. _"Password"_ -> Your facturama account password
+
+   v. _"Sandbox mode"_ -> If you don't want to send your invoices to SAT and just test
+
+**Note:** The module won't assign a cause for the error if the configuration fails, it will just display that the service hasn't been succesfully configured. Make sure credentials are correct as you add them in the service form.
+
+### Issuers
+This module lets the user choose between different profiles that will emmit the invoice
+
+1. Go to Invoicing > Configuration > CFDI > Issuers
+2. Create a new record and add the following information corresponding to the Facturama information:
+    - Name
+    - Fiscal name
+    - Tax ID
+    - Zip
+    - Fiscal regime
+3. Add the stamping certificate (CSD) and its corresponding key archive and CSD password
+4. Add the previously created service record (“Facturama”)
+5. Click **"Register"**
+6. If the issuer is registered correctly, the checkbox will appear checked and the error message will disappear.
+
+**Configuration will be completed at this point**