init package and added README.md

.Rbuildignore

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

.gitignore

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+.Rproj.user
+.Rhistory
+.RData
+.Ruserdata

DESCRIPTION

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+Package: extdplyr
+Type: Package
+Title: Data Manipulation Extension based on dplyr and tidyr
+Version: 0.1.0.900
+Authors@R: person("Yuchen", "Wang", email = "[email protected]",
+    role = c("aut", "cre"))
+Description: If `dplyr` is a grammar for data manipulation, `extdplyr` is like
+    a short paragraph written in `dplyr`. `extdplyr` extends `dplyr` and
+    `tidyr` verbs to some common "routines" that manipulate datasets. It uses
+    the same interface and preserves all features from `dplyr` like fast
+    performance and various data sources.
+License: MIT + file LICENSE
+Encoding: UTF-8
+LazyData: true
+Imports:
+    dplyr,
+    tidyr
+RoxygenNote: 5.0.1

LICENSE

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+YEAR: 2017
+COPYRIGHT HOLDER: Yuchen Wang

NAMESPACE

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+# Generated by roxygen2: do not edit by hand
+

README.md

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+`extdplyr` is an extension package for data manipulation based on `dplyr` and `tidyr`.
+
+If `dplyr` is a grammar for data manipulation, `extdplyr` is like a short paragraph written in `dplyr`. `extdplyr` extends `dplyr` and `tidyr` verbs to some common "routines" that manipulate datasets. It uses the same interface and preserves all features from `dplyr` like fast performance and various data sources.
+
+### Motivation
+`dplyr` is powerful but also restrained in that it aims to provide the most important tools, but not to suit every needs. After several years of extensive use of `dplyr`, I found that some combinations of `dplyr` verbs become too frequent in my code that I wanted to extract them as functions. This is the origin of those routines in `extdplyr`.
+
+
+Also there are some cases where the operations don't comform to `dplyr`'s rules. Naturally one wouldn't expect these operations to be included into `dplyr`, but they can be implemented here for the occasional use.

extdplyr.Rproj

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+Version: 1.0
+
+RestoreWorkspace: Default
+SaveWorkspace: Default
+AlwaysSaveHistory: Default
+
+EnableCodeIndexing: Yes
+UseSpacesForTab: Yes
+NumSpacesForTab: 2
+Encoding: UTF-8
+
+RnwWeave: knitr
+LaTeX: XeLaTeX
+
+AutoAppendNewline: Yes
+StripTrailingWhitespace: Yes
+
+BuildType: Package
+PackageUseDevtools: Yes
+PackageInstallArgs: --no-multiarch --with-keep.source
+PackageRoxygenize: rd,collate,namespace