Added Register Screen and started Lost_PW Screen

Frontend/app/src/main/AndroidManifest.xml

...tend/app/src/main/java/com/example/mobileapp/Lost_PW.java

.../src/main/java/com/example/mobileapp/Register_Screen.java

...app/src/main/java/com/example/mobileapp/Start_Screen.java

Frontend/app/src/main/res/drawable-hdpi/back_button.png

Frontend/app/src/main/res/drawable-hdpi/eye_icon.png

Frontend/app/src/main/res/drawable-hdpi/person_icon.png

Frontend/app/src/main/res/drawable-mdpi/back_button.png

Frontend/app/src/main/res/drawable-mdpi/eye_icon.png

Frontend/app/src/main/res/drawable-mdpi/person_icon.png

Frontend/app/src/main/res/drawable-xhdpi/back_button.png

Frontend/app/src/main/res/drawable-xhdpi/eye_icon.png

Frontend/app/src/main/res/drawable-xhdpi/person_icon.png

Frontend/app/src/main/res/drawable-xxhdpi/back_button.png

Frontend/app/src/main/res/drawable-xxhdpi/eye_icon.png

Frontend/app/src/main/res/drawable-xxhdpi/person_icon.png

Frontend/app/src/main/res/drawable-xxxhdpi/back_button.png

Frontend/app/src/main/res/drawable-xxxhdpi/eye_icon.png

Frontend/app/src/main/res/drawable-xxxhdpi/person_icon.png

Frontend/app/src/main/res/drawable/btn_rounded.xml