SNOMED readme initial commit for download instructions

Author: antsh3k

data/snomed/ReadMe.md

@@ -0,0 +1,51 @@
+# SNOMED
+
+Place holder for all SNOMED related content and downloads here
+
+--------
+
+##About
+SNOMED CT is a standarised clinical terminology consisting of >350,000 unique concepts. It is owned, maintained and distributed by SNOMED International.
+
+Please visit and explore https://www.snomed.org/ to find out further information about the various SNOMED CT products and services which they offer.
+
+
+## What is SNOMED CT?
+
+SNOMED CT is a clinical terminology containing concepts with unique meanings and formal logic based definitions organised into hierarchies. For further information please see: https://confluence.ihtsdotools.org/display/DOCSTART/4.+SNOMED+CT+Basics
+
+## SNOMED CT Design
+SNOMED CT content is represented into 3 main types of components:
+
+- Concepts representing clinical meanings that are organised into hierarchies.
+- Descriptions which link appropriate human readable terms to concepts
+- Relationships which link each concept to other related concepts
+
+It also contains mappings to classification systems such as:
+- ICD (International classifications of diseases)
+- OPCS (Office of Population Censuses and Surveys) (SNOMED UK extension only)
+
+---------
+
+<a name="access_to_snomed_ct"></a>
+## Access to SNOMED CT release files
+
+You may download SNOMED CT at the Member country’s designated website. The use of SNOMED CT in Member countries is free. Follow this [link](https://www.snomed.org/our-stakeholders/members) to find out if your country is a member state and explore the website to find directions to where to your national SNOMED CT distribution is held.
+
+E.g. 
+* UK -> [NHS TRUD](https://isd.digital.nhs.uk/trud3/user/guest/group/0/home)
+
+* US -> [NIH National Library of Medicine](https://www.nlm.nih.gov/healthit/snomedct/international.html) Alternative clinical terminologies such as UMLS can be found here.
+
+
+The following Steps are to services provided by SNOMED International for organizations and individuals to request use and access to the International Release of SNOMED CT for use in non-Member countries
+
+__To access SNOMED CT files from non-member contries:__
+
+1.   Please visit the SNOMED [Member Licensing and Distribution Service.](https://mlds.ihtsdotools.org/#/landing) and read their terms and conditions for use.
+
+2.   Login or Register for an account and wait to be granted access.
+
+3.   Once you have been granted access. Logged in and visit the tab ["Release Packages"](https://mlds.ihtsdotools.org/#/viewReleases) and retrieve the release of SNOMED CT that you would like to have. Alternatively, for the international SNOMED release simply visit the [International releases](https://mlds.ihtsdotools.org/#/viewReleases/viewRelease/167).
+
+----------