Create README.md

Author: lakshay1296

README.md

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+# Android-app-using-SQLite
+Android App which uses SQLite Database to store and retrieve data.
+
+<h2>Screenshots</h2>
+
+<img src = "https://github.com/lakshay1296/Android-app-using-SQLite/blob/master/Screenshot_1528349407.png" height = "520" width = "300" />  <img src = "https://github.com/lakshay1296/Android-app-using-SQLite/blob/master/Screenshot_1528349424.png" height = "520" width = "300" />
+
+<h2><b>Features</b></h2>
+
+1. Add new data
+
+2. Update existing data
+
+3. Update single, multiple or all the fields present in the database
+
+4. Delete data
+
+5. View data
+
+6. Automatic Date and Time insertion
+
+7. Easy to implement and make changes
+
+<h2><b>How to use</b></h2>
+
+1. Just copy the code and classes to your project <b>or</b>
+
+2. Import project to android studio
+
+<h2><b>How to make changes in table</b></h2>
+
+If you want to add or remove columns from table:
+
+1. You need to add or remove column name from the "create table" query.
+
+2. Update the version of the database which can be found in <b>DatabaseHelper.java</b> 
+
+```
+public DatabaseHelper(Context context) {
+        super( context, DATABASE_NAME, null, 2 );
+
+    }
+```
+Here, integer 2 mentions the version.
+
+3. After adding columns update AddData() or updateData() methods so that they can accept values for the extra columns.
+
+```
+ public boolean instertData(String name, String surname, String marks, String date){
+        // Rest of the code
+        }
+```
+
+4. Add new column in <b>ContentValues</b> for inserting or updating the values in database.
+```
+contentValues.put( "Column name which is defined in database", "value of the method which you need to insert in the column of DB, For eg. name" );
+```
+That's it! It's a very simple app which helps you in understanding the concept of implementing SQLite Database in an Android application.