added readme.md file

lib/Database/README.md

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+# Database Module
+This folder is a way of making the database usage inside of the API more modular.
+
+
+
+### Prototype : 
+
+`Database(url, options)` 
+
+Where: 
+
+`url` is the connection string of the database that you would like to connect to.
+
+`options` is an object with the following keys: 
+
+ * `schema`: which is an object that contains a set of key-value pairs, key is the name of the record/table you want to add, value is a reference to the schema object that defines this record/table.
+
+-- the schema object defaults to all the schema objects that are defined to the system.
+
+-- more options will be added in the future for example different database types. 
+
+### Basic usage : 
+This is mostly how it's going to be used:
+
+```javascript
+  const url = 'your-db-connection-url';
+  const db = new Database(url);
+
+  // to find all users.
+  const users = db.User.find();
+````
+
+In case of differenct schema in mind here's an example: 
+
+```javascript
+  const userSchema = require('./schema/userSchema');
+  const url = 'your-db-connection-url';
+  const db = new Database(url, {
+    schema: {
+      "User": userSchema
+    }
+  );
+  
+  // to find all users.
+  const users = db.User.find();
+````
+
+### Goal:
+
+This approach is a way of making the database instantiatable for more functionality such as the multi-tenancy functionality instead of using the static
+database object provided by mongoose, we can use the modular opproach or a mix of both modular and static.
+