Setup initial file structure

Modules/ado/personal/d/dropmissing.ado

@@ -0,0 +1,23 @@
+program define dropmissing
+syntax varlist [, missing(string) delete]
+
+tokenize `varlist'
+local nbitems:word count `varlist'
+if "`missing'"=="" {
+	local missing="."
+}
+
+local nbmissing:word count `missing'
+
+forvalues i=1/`nbitems' {
+	forvalues j=1/`nbmissing' {
+		local miss:word `j' of `missing'
+		if "`delete'"!="" {
+                        drop if ``i''==`miss'
+                }
+                else {
+                        replace ``i'=. if ``i''==`miss'
+                }
+	}
+}
+end