Initial spec: add

spec/add.md

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+# `dvs add`
+
+Goal: Add files to an initialized dvs project.
+
+## CLI
+
+```sh
+dvs add <FILES> [OPTIONS]
+
+Files:
+    List of files to add
+
+Options:
+    -m, --message  Message attributed to the add event
+    --glob         Glob expression of the files to add, e.g. (`/phaseA/**/*.csv`)
+    --json Command output as JSON format
+    -h, --help
+
+```
+
+`dvs add` will not accept directories as input. However, if all files following a glob expression is to be added, the end-user can use `--glob`/`glob=` in the cli and R package resp.
+
+## R
+
+Signature:
+
+```r
+dvs_add <- function(
+  files = character(), # either files or glob are required
+  message, # not required, can be missing, `NULL`, "", and character() (empty)
+  glob = character(), # either files or glob are required
+  parallel = TRUE # enable parallel
+)
+```