Created Emoji (markdown)

Emoji.md

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+## About markdown changes
+
+Wekan v4.29 changes markdown rendering from [marked](https://github.com/markedjs/marked) to [markdown-it](https://github.com/markdown-it/markdown-it).
+
+## About emoji
+
+With markdown-it, also [markdown-it-emoji](https://github.com/markdown-it/markdown-it-emoji) plugin has been added, supporting [full list of GitHub emojis](https://github.com/markdown-it/markdown-it-emoji/blob/master/lib/data/full.json).
+
+## About other markdown-it plugins
+
+For markdown-it, there are also other [syntax extensions](https://github.com/markdown-it/markdown-it#syntax-extensions) where some are listed at that markdown-it page, and [others at npmjs.com](https://www.npmjs.org/browse/keyword/markdown-it-plugin).
+
+For example, how to get some [mermaid plugin](https://www.npmjs.com/search?q=markdown-it-mermaid) working so that some syntax works for https://mermaid-js.github.io/mermaid/ ?
+
+## How you could add another plugin
+
+Using Ubuntu 20.04 64bit:
+
+### 1. Install git and configure it
+```
+sudo apt -y install git
+git config --global user.name "Yourfirstname Yourlastname"
+git config --global user.email email-address-you-use-at-github@example.com
+git config --global push.default simple
+```
+
+### 2. Create fork of `https://github.com/wekan/wekan`
+```
+git clone git@github.com:YourGithubUsername/wekan.git
+cd wekan
+./rebuild-wekan.sh
+```
+### 3. Select option 1 to install dependencies, and then Enter.
+```
+./rebuild-wekan.sh
+```
+### 4. Select option 2 to build Wekan, and then Enter
+
+### 5. Add new plugin package
+```
+meteor npm install markdown-it-something --save
+```
+### 5. Edit file
+
+Edit file `wekan/packages/markdown/src-integration.js` and add using that new package, using code example from that new plugin page, or similar like emoji plugin was added.
+
+### 6. Start meteor in Wekan directory
+
+For example:
+```
+meteor --port 4000
+```
+And then [register and login](https://github.com/wekan/wekan/wiki/Adding-users) at http://localhost:4000
+
+
+### 7. Test
+
+Test does that new plugin syntax work, for example in card title, card description etc on other input fields.
+
+### 8. If it works
+
+If normal markdown, emoji, and your new added plugin syntax all work, commit your changes:
+```
+git add --all
+git commit -m "Added plugin markdown-it-something."
+git push
+```
+And then at your GitHub for `https://github.com/YOUR-GITHUB-USERNAME/wekan` click `Create pull request`.
+
+