@januz's checkbox example

ref #420

inst/misc/example.credentials

@@ -33,3 +33,4 @@ redcap_uri,username,project_id,token,comment
 "https://bbmc.ouhsc.edu/redcap/api/","myusername","2632","D7DDE242E717619E17F7DF0D3CE582B1","decimal dot"
 "https://bbmc.ouhsc.edu/redcap/api/","myusername","2634","8F5313CAA266789F560D79EFCEE2E2F1","Validation Types"
 "https://bbmc.ouhsc.edu/redcap/api/","myusername","3003","1F2EC7059AC339DFDCD5800225DC7A95","Blank for Gray Status"
+"https://bbmc.ouhsc.edu/redcap/api/","myusername","3074","5007DC786DBE39CE77ED8DD0C68069A6","Checkboxes 1"

inst/test-data/checkboxes-1/data.csv

@@ -0,0 +1,5 @@
+record_id,form_1_complete,check_one___1,check_one___2,check_one___3,check_one___4,check_two___a,check_two___b,check_two___c,check_two___d,check_two___e,desired_result,form_2_complete
+1,0,1,0,0,0,1,0,1,0,0,"Should have data for both checkbox items:    check_one:    - check_one___1 should be 1  - check_one___[2-4] should be 0    check_two:    - check_two___a should be 1  - check_two___c should be 1  - check_one___[b;d;e] should be 0    completion status should be 2",2
+2,0,0,0,0,0,0,1,0,1,0,"Should have data only for the second checkbox item:    check_one:    - check_one___[1-4] should be NA    check_two:    - check_two___b should be 1  - check_two___d should be 1  - check_one___[a;c;e] should be 0    completion status should be 1",0
+3,0,1,1,1,1,0,0,0,0,0,"Should have data for only the first checkbox item:    check_one:    - check_one___[1-4] should be 1    check_two:    - check_two___[a-e] should be NA  - check_two___c should be 1  - check_one___[b;d;e] should be 0    completion status should be 2",2
+4,0,0,0,0,0,0,0,0,0,0,,0

inst/test-data/checkboxes-1/dictionary.csv

@@ -0,0 +1,5 @@
+"Variable / Field Name","Form Name","Section Header","Field Type","Field Label","Choices, Calculations, OR Slider Labels","Field Note","Text Validation Type OR Show Slider Number","Text Validation Min","Text Validation Max",Identifier?,"Branching Logic (Show field only if...)","Required Field?","Custom Alignment","Question Number (surveys only)","Matrix Group Name","Matrix Ranking?","Field Annotation"
+record_id,form_1,,text,"Record ID",,,,,,,,,,,,,
+check_one,form_2,,checkbox,"check one","1, one | 2, two | 3, three | 4, four",,,,,,,,,,,,
+check_two,form_2,,checkbox,"check two","a, A | b, B | c, C | d, D | e, E",,,,,,,,,,,,
+desired_result,form_2,,notes,"What should happen for this participant",,,,,,,,,,,,,