feat: add default letterhead with HTML template via after_install

erpnext/accounts/letterhead/letterhead_plain.html

@@ -28,6 +28,7 @@
         max-width: 90px;
         max-height: 90px;
         display: inline-block;
+        border-radius: 15px;
     }
     .company-details {
         width: 40%;

erpnext/setup/install.py

@@ -2,6 +2,8 @@
 # License: GNU General Public License v3. See license.txt
 
 
+import os
+
 import frappe
 from frappe import _
 from frappe.custom.doctype.custom_field.custom_field import create_custom_fields
@@ -34,6 +36,7 @@ def after_install():
 	update_roles()
 	make_default_operations()
 	update_pegged_currencies()
+	create_letter_head()
 	frappe.db.commit()
 
 
@@ -279,6 +282,38 @@ def update_pegged_currencies():
 	doc.save()
 
 
+def create_letter_head():
+	base_path = frappe.get_app_path("erpnext", "letterhead")
+	letterhead_with_background_colour = frappe.read_file(
+		os.path.join(base_path, "letterhead_with_background_colour.html")
+	)
+	letterhead_plain = frappe.read_file(os.path.join(base_path, "letterhead_plain.html"))
+
+	if not frappe.db.exists("Letter Head", "Letterhead with background colour"):
+		doc = frappe.get_doc(
+			{
+				"doctype": "Letter Head",
+				"letter_head_name": "Letterhead with background colour",
+				"source": "HTML",
+				"content": letterhead_with_background_colour,
+			}
+		)
+		doc.insert(ignore_permissions=True)
+		frappe.db.commit()
+
+	if not frappe.db.exists("Letter Head", "Letterhead Plain"):
+		doc = frappe.get_doc(
+			{
+				"doctype": "Letter Head",
+				"letter_head_name": "Letterhead plain",
+				"source": "HTML",
+				"content": letterhead_plain,
+			}
+		)
+		doc.insert(ignore_permissions=True)
+		frappe.db.commit()
+
+
 DEFAULT_ROLE_PROFILES = {
 	"Inventory": [
 		"Stock User",