readme: update readme

Author: khadkarajesh

README.md

@@ -0,0 +1,18 @@
+# firebase-auth
+Firebase authentication library
+
+# To get a Git project into your build:
+
+Step 1. Add it in your root build.gradle at the end of repositories:
+```gradle
+   allprojects {
+		repositories {
+			maven { url 'https://jitpack.io' }
+		}
+	 }
+```
+Step 2. Add the dependency
+```gradle
+   implementation 'com.github.khadkarajesh:firebase-auth:v0.1.0-alpha'
+```
+