docs: update

.env

@@ -21,6 +21,8 @@ PATH_TO_SAVE=
 # The actual sub path to the api
 # string
 # (optional)
+# If the specified path ends with "/api", the system will avoid duplicating "api" in the final URL.
+# This allows flexible API structuring, especially when running behind a reverse proxy or in containerized environments.
 ACTUAL_SUB_PATH=
 
 # The sub path to the swagger
@@ -114,4 +116,48 @@ SECURITY_HASH_TOKEN=
 # The size of the salt used to hash passwords
 # integer
 # The salt is a random value added to the password before hashing to prevent the use of rainbow hash tables and other attacks.
-SECURITY_SALT_SIZE=16
+SECURITY_SALT_SIZE=16
+
+### OAuth2
+
+#### GOOGLE
+
+# The client ID for Google OAuth
+# string
+# This is the client ID provided by Google when you register your application for OAuth.
+# It's necessary for enabling Google login functionality.
+GOOGLE_CLIENT_ID=
+
+# The client secret for Google OAuth
+# string
+# This is the client secret provided by Google, used alongside the client ID to authenticate your application.
+# Make sure to keep it confidential.
+GOOGLE_CLIENT_SECRET=
+
+#### Yandex
+
+# The client ID for Yandex OAuth
+# string
+# This is the client ID provided by Yandex when you register your application for OAuth.
+# It's required for enabling Yandex login functionality.
+YANDEX_CLIENT_ID=
+
+# The client secret for Yandex OAuth
+# string
+# This is the client secret provided by Yandex, used alongside the client ID to authenticate your application.
+# Keep it confidential to ensure the security of your app.
+YANDEX_CLIENT_SECRET=
+
+#### MailRu
+
+# The client ID for MailRu OAuth
+# string
+# This is the client ID provided by MailRu (Mail.ru Group) when you register your application for OAuth.
+# It's necessary for enabling MailRu login functionality.
+MAILRU_CLIENT_ID=
+
+# The client secret for MailRu OAuth
+# string
+# This is the client secret provided by MailRu, used alongside the client ID to authenticate your application.
+# Keep it confidential to ensure the security of your app.
+MAILRU_CLIENT_SECRET=