Add the 'Conditionals' lesson to csintro. (#428)

docs/courses/csintro/conditionals/standards.md

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+# Standards
+
+## CSTA K-12 Computer Science Standards
+
+* CL.L2-03 Collaborate with peers, experts, and others using collaborative practices such as pair programming, working in project teams, and participating in group active learning activities.
+* CL.L2-04 Exhibit dispositions necessary for collaboration: providing useful feedback, integrating feedback, understanding and accepting multiple perspectives, socialization.   
+* CL.L3A-01 Work in a team to design and develop a software artifact.
+* K-12 Computer Science Framework Core concept: Control Structures