Create tech stack docs (techstack.yml and techstack.md)

[stack-file]

Adding tech stack documentation to allow anyone to easily see what is being used in this repo without digging through config files. Two files are being added: techstack.yml and techstack.md. techstack.yml contains data on all the technologies being used in this repo. techstack.md is a visualization of the YML file and displays the tech stack data in a pretty Markdown file.

💡 Protip: techstack.md contains a comment at the top of the file that the following README snippet (with and without the logos) at the top of the file as a comment:

<--- Readme.md Snippet without images Start --->

Tech Stack

IHTSDO/snomed-release-service is built on the following main stack:

• Java – Languages
• Spring Framework – Frameworks (Full Stack)
• ActiveMQ – Message Queue
• H2 Database – Databases
• Liquibase – Database Tools
• JUnit – Testing Frameworks
• SLF4J – Log Management
• Apache Camel – Platform as a Service
• Shell – Shells

Full tech stack here

<--- Readme.md Snippet without images End --->

Get the code:

## Tech Stack
IHTSDO/snomed-release-service is built on the following main stack:

- [Java](https://www.java.com) – Languages
- [Spring Framework](https://spring.io/projects/spring-framework) – Frameworks (Full Stack)
- [ActiveMQ](http://activemq.apache.org/) – Message Queue
- [H2 Database](http://www.h2database.com/) – Databases
- [Liquibase](https://www.liquibase.com) – Database Tools
- [JUnit](http://junit.org/) – Testing Frameworks
- [SLF4J](http://slf4j.org/) – Log Management
- [Apache Camel](https://camel.apache.org/) – Platform as a Service
- [Shell](https://en.wikipedia.org/wiki/Shell_script) – Shells

Full tech stack [here](/techstack.md)

---

<--- Readme.md Snippet with images Start --->

Tech Stack

IHTSDO/snomed-release-service is built on the following main stack:

• Java – Languages
• Spring Framework – Frameworks (Full Stack)
• ActiveMQ – Message Queue
• H2 Database – Databases
• Liquibase – Database Tools
• JUnit – Testing Frameworks
• SLF4J – Log Management
• Apache Camel – Platform as a Service
• Shell – Shells

Full tech stack here

<--- Readme.md Snippet with images End --->

Get the code:

## Tech Stack
IHTSDO/snomed-release-service is built on the following main stack:

- <img width='25' height='25' src='https://img.stackshare.io/service/995/K85ZWV2F.png' alt='Java'/> [Java](https://www.java.com) – Languages
- <img width='25' height='25' src='https://img.stackshare.io/service/2006/spring-framework-project-logo.png' alt='Spring Framework'/> [Spring Framework](https://spring.io/projects/spring-framework) – Frameworks (Full Stack)
- <img width='25' height='25' src='https://img.stackshare.io/service/1062/default_08edb6f82e2c79424efc1e297ab096e50acd8e0b.jpg' alt='ActiveMQ'/> [ActiveMQ](http://activemq.apache.org/) – Message Queue
- <img width='25' height='25' src='https://img.stackshare.io/service/3105/h2-logo_square_400x400.png' alt='H2 Database'/> [H2 Database](http://www.h2database.com/) – Databases
- <img width='25' height='25' src='https://img.stackshare.io/service/1398/y1As8_s5_400x400.jpg' alt='Liquibase'/> [Liquibase](https://www.liquibase.com) – Database Tools
- <img width='25' height='25' src='https://img.stackshare.io/service/2020/874086.png' alt='JUnit'/> [JUnit](http://junit.org/) – Testing Frameworks
- <img width='25' height='25' src='https://img.stackshare.io/service/2805/05518ecaa42841e834421e9d6987b04f_400x400.png' alt='SLF4J'/> [SLF4J](http://slf4j.org/) – Log Management
- <img width='25' height='25' src='https://img.stackshare.io/service/3276/xWt1RFo6_400x400.jpg' alt='Apache Camel'/> [Apache Camel](https://camel.apache.org/) – Platform as a Service
- <img width='25' height='25' src='https://img.stackshare.io/service/4631/default_c2062d40130562bdc836c13dbca02d318205a962.png' alt='Shell'/> [Shell](https://en.wikipedia.org/wiki/Shell_script) – Shells

Full tech stack [here](/techstack.md)