Categorize and Tag all patterns

[markusmo3]

Due to splitting the issues up some information like the category got lost. And we have those cool new Tags.

All the index.md files of the patterns should get relevant categories and tags in the yaml frontmatter. The 'pattern_cat' and 'pattern_tag' stuff can be removed as it is only a placeholder...

The 'How to Contribute' Section of the README in master should explain everything that is needed for this issue.

EDIT:
After this point is done we should remove the pattern list from the master README file.

TODO:

• Categorized all Patterns (done with adbb4ac)
• Clarify Test if we can use proper casing instead of camel case as shown in adbb4ac. EDIT: I looked it up, it should work without "", e.g. just -> Creational Patterns
  (done with 5ce932c)
• Tag all Patterns
  (partially done the with usage of tag "Java" instead of placeholder :P 5ce932c)
• Remove pattern list from master README
  (done with 5ce932c)

[iluwatar]

Is there some limitation why we need to use snake casing e.g. presentation_tier? Can't we just type Presentation tier or maybe YAML need "Presentation tier".

[iluwatar]

What would be good tags to use? I'm thinking of implementation technologies e.g. Spring and Camel.

[markusmo3]

Hmmm, to be honest im not too sure about beeing able to use proper casing with spaces. I'd say try it out and if it works then it definitly looks better than camel casing, right ?

And Tags, yeah. Maybe some things that differences this pattern from other ones. Like if its an EJB only pattern, JEE or JSE, ... The technologies used or similar to the pattern also sounds quite good. But i agree, this needs more clarification...

[npathai]

👍 Technologies can be tags for sure. Some other tags that I thought of are Functional, Persistence, I/O. But I am still figuring it out.

[npathai]

We need to tag based on difficulty as well.

[iluwatar]

I did the categorization and tagging of the patterns today. The used categories and tags can be seen here.