Add timein, send-custom-html, jadict plugins (#15)

* Add timein plugin

* Add send-custom-html plugin

* Add jadict plugin

data/plugins/thirdparty/jadict.yaml

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+name: jadict
+repo: https://github.com/coffeebank/coffee-maubot/tree/master/jadict
+license: AGPL-3.0-or-later
+author: coffeebank
+description: A Japanese dictionary Matrix bot for searching and translating Japanese vocabulary (Hiragana, Katakana, Kanji, Romaji). Searches Jisho using Jisho API.
+public_instances: []

data/plugins/thirdparty/send-custom-html.yaml

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+name: send-custom-html
+repo: https://github.com/coffeebank/coffee-maubot/tree/master/send-custom-html
+license: AGPL-3.0-or-later
+author: coffeebank
+description: Have the bot send a message as custom HTML. Test and preview formatted HTML body in Matrix.
+public_instances: []

data/plugins/thirdparty/timein.yaml

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+name: timein
+repo: https://github.com/coffeebank/coffee-maubot/tree/master/timein
+license: AGPL-3.0-or-later
+author: coffeebank
+description: Get the time in specific cities. Check timezones.  !timein New York  (Python 3.9+) (Python <3.9 requires pytz, fuzzywuzzy)
+public_instances: []