feat: added markdown editor for editing problems in markdown format (#1805)

src/editors/data/constants/basicProblemTemplates/dropdown.js

@@ -0,0 +1,18 @@
+/* eslint-disable */
+const olx = `<problem>
+  <optionresponse>
+    <optioninput>
+      <option correct="True"></option>
+      <option correct="False"></option>
+      <option correct="False"></option>
+    </optioninput>
+  </optionresponse>
+</problem>`
+
+const markdown = `[[
+an incorrect answer
+(the correct answer)
+an incorrect answer
+]]`
+
+export default { olx, markdown };

src/editors/data/constants/basicProblemTemplates/index.js

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+import { StrictDict } from '../../../utils';
+import dropdown from './dropdown';
+import multiSelect from './multiSelect';
+import numeric from './numeric';
+import singleSelect from './singleSelect';
+import textInput from './textInput';
+
+export default StrictDict({
+  dropdown, multiSelect, numeric, singleSelect, textInput,
+});

src/editors/data/constants/basicProblemTemplates/multiSelect.js

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+/* eslint-disable */
+ const olx= `<problem>
+  <choiceresponse>
+    <checkboxgroup>
+      <choice correct="true"></choice>
+      <choice correct="false"></choice>
+      <choice correct="false"></choice>
+    </checkboxgroup>
+  </choiceresponse>
+</problem>`
+
+const markdown = `[x] a correct answer
+[ ] an incorrect answer
+[ ] an incorrect answer
+[x] a correct answer
+`
+
+export default { olx, markdown };

src/editors/data/constants/basicProblemTemplates/numeric.js

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+/* eslint-disable */
+const olx = `<problem>
+  <numericalresponse>
+    <responseparam type="tolerance" default="5"/>
+    <formulaequationinput/>
+  </numericalresponse>
+</problem>`
+
+const markdown = `= 100 +-5`
+
+export default { olx, markdown };

src/editors/data/constants/basicProblemTemplates/singleSelect.js

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+/* eslint-disable */
+const olx = `<problem>
+  <multiplechoiceresponse>
+    <choicegroup>
+      <choice correct="true"></choice>
+      <choice correct="false"></choice>
+      <choice correct="false"></choice>
+    </choicegroup>
+  </multiplechoiceresponse>
+</problem>`
+
+const markdown = `( ) an incorrect answer
+(x) the correct answer
+( ) an incorrect answer
+`
+
+export default { olx, markdown };

src/editors/data/constants/basicProblemTemplates/textInput.js

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+/* eslint-disable */
+const olx =`<problem>
+  <stringresponse type="ci">
+    <additional_answer />
+    <textline size="20"/>
+  </stringresponse>
+</problem>`
+
+const markdown = `= the correct answer
+or= optional acceptable variant of the correct answer
+`
+
+export default { olx, markdown };