Add textMetadata function to retrieve metadata via sigle(s)

Change-Id: I34714bce07635732d0534f83a48865d6d64903da
diff --git a/DESCRIPTION b/DESCRIPTION
index 2136bf2..b2f7978 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -67,4 +67,5 @@
     'hc_freq_by_year_ci.R'
     'misc.R'
     'reexports.R'
+    'textMetadata.R'
 Roxygen: list(markdown = TRUE)