Transfrom the project into a package project

.Rbuildignore

+^.*\.Rproj$
+^\.Rproj\.user$

DESCRIPTION

+Package: ProcMod
+Type: Package
+Title: What the Package Does (Title Case)
+Version: 0.1.0
+Author: Who wrote it
+Maintainer: The package maintainer <yourself@somewhere.net>
+Description: More about what it does (maybe more than one line)
+    Use four spaces when indenting paragraphs within the Description.
+License: What license is it under?
+Encoding: UTF-8
+LazyData: true
\ No newline at end of file

NAMESPACE

+exportPattern("^[[:alpha:]]+")

ProcMod.Rproj

@@ -13,3 +13,8 @@ RnwWeave: knitr
 LaTeX: pdfLaTeX
 
 AutoAppendNewline: Yes
+StripTrailingWhitespace: Yes
+
+BuildType: Package
+PackageUseDevtools: Yes
+PackageInstallArgs: --no-multiarch --with-keep.source

R/hello.R

+# Hello, world!
+#
+# This is an example function named 'hello' 
+# which prints 'Hello, world!'.
+#
+# You can learn more about package authoring with RStudio at:
+#
+#   http://r-pkgs.had.co.nz/
+#
+# Some useful keyboard shortcuts for package authoring:
+#
+#   Build and Reload Package:  'Cmd + Shift + B'
+#   Check Package:             'Cmd + Shift + E'
+#   Test Package:              'Cmd + Shift + T'
+
+hello <- function() {
+  print("Hello, world!")
+}

man/hello.Rd

+\name{hello}
+\alias{hello}
+\title{Hello, World!}
+\usage{
+hello()
+}
+\description{
+Prints 'Hello, world!'.
+}
+\examples{
+hello()
+}