Added architectural specifications.

Author: Nyah Check

ARCHITECTURE.md

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+# ARCHITECTURE
+
+YTD is a tool for searching and downloading video and audio content from Youtube. It includes primitives for basic data retrieval, content search, download and conversion to other audio and video file formats. 
+
+
+## Overview
+
+It contains three main packages namely: 
+* the API(Data retrieval and requests to the Youtube API), 
+* Auth(Uses OAuth to make authenticated requests by the API package) when connecting to the Youtube API. There also consists a converter which is part of the API package to convert downloaded youtube data into other file formats such as FLV and mp3 only. 
+* The CMD basically gets the tool up and running taking queries from the user and returning data output to the user.
+
+  ----------------------          =========================
+  |
+  |						  OAuth		
+  |   API               |  -----> |	   Youtube API
+  |						  
+  |
+  ----------------------          =========================
+
+		^
+		'
+		'
+		'
+		
+		
+   ---------------------					-------------------
+   					   |					|				  |
+   		Auth				<------->              CMD
+   					   |				    |                 |
+   ---------------------                    -------------------
+
+	--> = Channel
+
+	
+## Features
+
+The basic features are listed here below
+
+* YTD API
+ **- apidata.go:	Sends authenticated requests to the Google Youtube API
+ 					Process video feeds and downloads video data from Youtube.
+ **- apisearch.go:	Performs search queries on Youtube and parses the results to `apidata.go`
+ **- apiconv.go:	Converts downloaded videos to FLV and mp3
+ 
+* YTD Auth
+ **- auth.go:	Uses OAuth to perform authenticated requests with Youtube, creating the `YoutubeRequestSettings` and `YoutubeSettings` objects.
+
+* YTD CMD
+ **- main.go:	Program entry point, gets queries from the user.
+ 				Creates requests via `AUTH` API and connects to `API` package and displays results to user.
+
+* YTD UI
+ **- ui.go:		UI creates GUI interface for parsing of response data to user(UI/UX)
+
+
+## Build
+
+Requirements:
+
+* Go 1.8 or higher
+* Docker CE 17
+* A working Golang environment
+* Protobuf 3.x or higher to regenerate protocol buffer files (e.g. using make generate)
+
+`ytd` is built in Go using the standard `go` project structure to work well with Go tooling.
+
+
+## Test
+
+Tests are ran by running `make` or `make all`
+
+```
+$ make
+```
+---