Adding Append Methods

[vickysharma0812]

• Adding append method for appending three vectors of real or integers.

[vickysharma0812]

• Minor updates in ReferenceElements #292
• Updates in reference prism #291
• Update in Reference Hexahedron #290
• Updates in Reference Tetrahedron #289
• Updates in Reference quadrangle #288
• Updates in Reference triangle #287
• Updates in ReferenceElements #286
• Adding Append Methods #285 👈
• dev

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Merge activity

• Mar 9, 1:42 AM EST: @vickysharma0812 started a stack merge that includes this pull request via Graphite.
• Mar 9, 1:42 AM EST: @vickysharma0812 merged this pull request with Graphite.