1 files changed, 36 insertions, 0 deletions
diff --git a/docs/guides/auth/github.md b/docs/guides/auth/github.md
new file mode 100644
index 00000000..62910cb2
--- /dev/null
+++ b/docs/guides/auth/github.md
@@ -0,0 +1,36 @@
+Authentication guide - GitHub
+===
+
+1. Sign-in or sign-up for a GitHub account
+2. Navigate to developer settings in your GitHub account [here](https://github.com/settings/developers) and select the "OAuth Apps" tab
+3. Click on the **New OAuth App** button, to create a new OAuth App:
+
+![create-oauth-app](../images/auth/create-oauth-app.png)
+
+4. Fill out the new OAuth application registration form, and click **Register Application**
+
+![register-oauth-application-form](../images/auth/register-oauth-application-form.png)
+
+*Note: The callback URL is <your-hackmd-url>/auth/github/callback*
+
+5. After successfully registering the application, you'll receive the Client ID and Client Secret for the application
+
+![application-page](../images/auth/application-page.png)
+
+6. Add the Client ID and Client Secret to your config.json file or pass them as environment variables
+    * config.json:
+      ````javascript
+      {
+        "production": {
+          "github": {
+              "clientID": "3747d30eaccXXXXXXXXX",
+              "clientSecret": "2a8e682948eee0c580XXXXXXXXXXXXXXXXXXXXXX"
+          }
+        }
+      }
+      ````
+    * environment variables:
+      ````
+      HMD_GITHUB_CLIENTID=3747d30eaccXXXXXXXXX
+      HMD_GITHUB_CLIENTSECRET=2a8e682948eee0c580XXXXXXXXXXXXXXXXXXXXXX
+      ````