feat 🚀 Auth 관련 class 추가

#23
- User class 추가
- GithubAccessToken class 추가

BE/src/main/java/kr/codesquad/airbnb12/domain/GithubAccessToken.java

@@ -0,0 +1,35 @@
+package kr.codesquad.airbnb12.domain;
+
+import com.fasterxml.jackson.annotation.JsonProperty;
+
+public class GithubAccessToken {
+
+    @JsonProperty("access_token")
+    private String accessToken;
+
+    @JsonProperty("token_type")
+    private String tokenType;
+
+    public GithubAccessToken() { }
+
+    public GithubAccessToken(String accessToken, String tokenType) {
+        this.accessToken = accessToken;
+        this.tokenType = tokenType;
+    }
+
+    public String getAccessToken() {
+        return accessToken;
+    }
+
+    public void setAccessToken(String accessToken) {
+        this.accessToken = accessToken;
+    }
+
+    public String getTokenType() {
+        return tokenType;
+    }
+
+    public void setTokenType(String tokenType) {
+        this.tokenType = tokenType;
+    }
+}

BE/src/main/java/kr/codesquad/airbnb12/domain/User.java

@@ -1,4 +1,35 @@
 package kr.codesquad.airbnb12.domain;
 
 public class User {
+
+    private Long id;
+
+    private String email;
+
+    public User() {}
+
+    public User(Long id, String email) {
+        this.id = id;
+        this.email = email;
+    }
+
+    public Long getId() {
+        return id;
+    }
+
+    public void setId(Long id) {
+        this.id = id;
+    }
+
+    public String getEmail() {
+        return email;
+    }
+
+    public void setEmail(String email) {
+        this.email = email;
+    }
+
+    public static User create(Long id, String email) {
+        return new User(id, email);
+    }
 }