docs: add optional env variables to readme

Author: asadali145

.env.development

@@ -1,8 +1,12 @@
+ABOUT_US_URL=
 ACCESS_TOKEN_COOKIE_NAME=edx-jwt-cookie-header-payload
+ACCESSIBILITY_URL=
 BASE_URL=localhost:8080
+CONTACT_URL=
 CREDENTIALS_BASE_URL=http://localhost:18150
 CSRF_TOKEN_API_PATH=/csrf/api/v1/token
 ECOMMERCE_BASE_URL=http://localhost:18130
+HONOR_CODE_URL=
 LANGUAGE_PREFERENCE_COOKIE_NAME=openedx-language-preference
 LMS_BASE_URL=http://localhost:18000
 LOGIN_URL=http://localhost:18000/login
@@ -12,21 +16,17 @@ TERMS_OF_SERVICE_URL=null
 PRIVACY_POLICY_URL=null
 SUPPORT_EMAIL=null
 STUDIO_BASE_URL=http://localhost:18010
+TRADEMARK_TEXT=
 ORDER_HISTORY_URL=localhost:1996/orders
 REFRESH_ACCESS_TOKEN_ENDPOINT=http://localhost:18000/login_refresh
 SEGMENT_KEY=null
+SHOW_LOGO=true
 SITE_NAME=Open edX
+SUPPORT_CENTER_TEXT=
+SUPPORT_CENTER_URL=
 USER_INFO_COOKIE_NAME=edx-user-info
+LOGO_ALT_TEXT="Open edX Logo"
 LOGO_URL=https://edx-cdn.org/v3/default/logo.svg
 LOGO_TRADEMARK_URL=https://edx-cdn.org/v3/default/logo-trademark.svg
 LOGO_WHITE_URL=https://edx-cdn.org/v3/default/logo-white.svg
 FAVICON_URL=https://edx-cdn.org/v3/default/favicon.ico
-ACCESSIBILITY_URL=
-ABOUT_US_URL=
-HONOR_CODE_URL=
-CONTACT_URL=
-SUPPORT_CENTER_URL=
-SUPPORT_CENTER_TEXT=
-TRADEMARK_TEXT=
-LOGO_ALT_TEXT=
-SHOW_LOGO=

README.rst

@@ -43,6 +43,21 @@ This component requires that the following environment variable be set by the co
 * ``LMS_BASE_URL`` - The URL of the LMS of your Open edX instance.
 * ``LOGO_TRADEMARK_URL`` - This is a URL to a logo for use in the footer.  This is a different environment variable than ``LOGO_URL`` (used in frontend-component-header) to accommodate sites that would like to have additional trademark information on a logo in the footer, such as a (tm) or (r) symbol.
 
+Optional Environment Variables
+=====================
+Apart from the required environment variables, this component also supports the following optional environment variable. These variables add the ability to display
+custom legal links in the footer. Optional Environment Variables can also be set by the consuming micro-frontend
+
+* ``ABOUT_US_URL`` - About Us page URL.
+* ``ACCESSIBILITY_URL`` - Accessibility page URL.
+* ``CONTACT_URL`` - Contact Us page URL.
+* ``HONOR_CODE_URL`` - Honor Code page URL.
+* ``LOGO_ALT_TEXT`` - Alt text for the logo.
+* ``SHOW_LOGO`` - Optionally display the logo.
+* ``SUPPORT_CENTER_TEXT`` - Text for the Support Center link i.e. `Help Center`.
+* ``SUPPORT_CENTER_URL`` - Support center URL.
+* ``TRADEMARK_TEXT`` - Trademark text.
+
 Installation
 ============