[Hexlet#159] add description how to add a OAuth data and delete own d…

…ata of OAuth app

README.md

@@ -25,6 +25,23 @@ To build the final jar:
 make build
 ```
 
+### How to add a OAuth2 app for local development
+Before starting local development, you must create an OAuth application and add clientID and clientSecret to application.yaml: 
+
+```bash
+clientId: #add clientId of your OAuth App
+clientSecret: #add clientSecret of your OAuth App
+```
+
+See more at https://spring.io/guides/tutorials/spring-boot-oauth2#github-register-application
+
+### How to add a OAuth2 app to external server
+You need to add environment variables:
+```bash
+GITHUB_CLIENT_ID
+GITHUB_CLIENT_SECRET
+```
+
 ### Development with vagrant
 
 Install Vagrant and VM provider (Virtualbox).

src/main/resources/config/application.yml

@@ -18,8 +18,8 @@ spring:
       client:
         registration:
           github:
-            clientId: Ov23liAF8M9hkDjqebdW
-            clientSecret: c7b69f3056cb406cca53ea412b0cd06353749731
+            clientId: #add clientId of your OAuth App
+            clientSecret: #add clientSecret of your OAuth App
             scope:
               - user:email
               - read:user