added auth classes (wip)

Author: ezTxmMC

src/main/java/com/nexoscript/requests4j/auth/APIKeyAuthentication.java

@@ -0,0 +1,4 @@
+package com.nexoscript.requests4j.auth;
+
+public class APIKeyAuthentication extends Authentication {
+}

src/main/java/com/nexoscript/requests4j/auth/Authentication.java

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+package com.nexoscript.requests4j.auth;
+
+public abstract class Authentication {
+}

src/main/java/com/nexoscript/requests4j/auth/BasicAuthentication.java

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+package com.nexoscript.requests4j.auth;
+
+public class BasicAuthentication extends Authentication {
+}

src/main/java/com/nexoscript/requests4j/auth/DigestAuthentication.java

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+package com.nexoscript.requests4j.auth;
+
+public class DigestAuthentication extends Authentication {
+}

src/main/java/com/nexoscript/requests4j/auth/OAuthAuthentication.java

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+package com.nexoscript.requests4j.auth;
+
+public class OAuthAuthentication extends Authentication {
+}