Require some parameters in create_project

[Andrew0Hill]

CIDAtools/R/project.R

Lines 159 to 163 in e84bb43

	create_project <- function(path = getwd(),
	template = c('Admin', 'Background', 'Code', 'DataRaw',
	'DataProcessed', 'Dissemination', 'Reports'),
	project_name = "", pi = "", analyst = "", data_location = "",
	git_location = "") {

Create project currently doesn't require any values to be specified (I no metadata is specified #48 occurs), but we should probably require a few of these values to be specified.

I think requiring:

• analyst
• project_name

Should be sufficient.

[abhinavvpundirr]

Made project_name and analyst required parameters in create_project() by removing their default values (= "") and adding validation with missing() and !nzchar() checks that throw a clear error if either is missing or empty.
Also updated proj_setup() (the RStudio GUI wrapper) to handle the case where a user leaves the analyst field blank in the New Project wizard — since the .dcf template format can't enforce required fields, proj_setup now substitutes a placeholder value and warns the user to update it with set_project_analyst().
Updated roxygen docs to mark both params as "(required)".