Update respective methods in Developer Guide

[bos10]

Developer Guide Tings

1. (Do this first) ALL is to update their individual features at the following places:
   a) Implementation > (I have included a skeleton to let you know where you start editting) *Please refer to how Piconso present their individual implementations, include the relevant diagrams, example usage, design consideration, alternatives etc.

Example picture :

b) User Stories and Use Case
-Update you own feature's respective story and use case. Including MSS all that shit (Please refer to Piconso one also again for the DG)

c) Instructions for manual testing
-Just imagine you are a user and you want to know how to test each feature MANUALLY. Provide the instructions and expected outcome for your feature.

2. We need to split the following among ourselves ON TOP of the individual features component
   a) Design>Architecture, we need to explain our
   -Logic, UI, Model, Storage components (each person take one) *UML DIAGRAMS REQUIRED

b) Non-Functional Requirements (easy)

c) Product Scope (easy)

**LINK TO PICONSO : https://github.com/CS2103-AY1819S1-T09-3/main/blob/master/docs/DeveloperGuide.adoc