Adding MWTB test

docs/_library/mwtb.md

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+---
+layout: experiment
+name:  "mwtb"
+maintainer: "@AlvaroAguilera"
+github: "https://github.com/expfactory-experiments/mwtb"
+preview: "https://expfactory-experiments.github.io/mwtb"
+tags:
+- test
+- jspsych
+- experiment
+---
+Multiple vocabulary test B (German). 

mwtb/config.json

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+{
+	"name": "Mehrfachwahl-Wortschatztest-B",
+	"template":"javascript",
+	"exp_id": "mwtb",
+	"url":"none yet",
+	"contributors": [
+		"Lena Alshut"
+	], 
+	"run": [
+	   "jspsych/jquery-3.5.1.min.js",
+		"jspsych/plugin-html-keyboard-response.js",
+		"jspsych/plugin-fullscreen.js",
+		"jspsych/jspsych.js",
+		"jspsych/plugin-html-button-response.js",
+		"jspsych/jspsych.css"
+	],
+	"time":25,
+	"reference": ["scientific publication"],
+	"publish":"False",
+	"notes": "notes we want to add",
+	"description": "a task inferring habit tendency",
+	"instructions": "follow instructions on screen"
+}