Add minimal README

Author: warnes

README.md

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+# Various R Programming Tools for Data Manipulation
+
+Various R programming tools for data manipulation, including:
+   - medical unit conversions ('ConvertMedUnits', 'MedUnits'),
+   - combining objects ('bindData', 'cbindX', 'combine', 'interleave'),
+   - character vector operations ('centerText', 'startsWith', 'trim'),
+   - factor manipulation ('levels', 'reorder.factor', 'mapLevels'),
+   - obtaining information about R objects ('object.size', 'elem', 'env',
+     'humanReadable', 'is.what', 'll', 'keep', 'ls.funs',
+     'Args','nPairs', 'nobs'),
+   - manipulating MS-Excel formatted files ('read.xls',
+     'installXLSXsupport', 'sheetCount', 'xlsFormats'),
+   - generating fixed-width format files ('write.fwf'),
+   - extricating components of date & time objects ('getYear', 'getMonth',
+     'getDay', 'getHour', 'getMin', 'getSec'),
+   - operations on columns of data frames  ('matchcols', 'rename.vars'),
+   - matrix operations ('unmatrix', 'upperTriangle', 'lowerTriangle'),
+   - operations on vectors ('case', 'unknownToNA', 'duplicated2', 'trimSum'),
+   - operations on data frames ('frameApply', 'wideByFactor'),
+   - value of last evaluated expression ('ans'), and
+   - wrapper for 'sample' that ensures consistent behavior for both
+     scalar and vector arguments ('resample').
+
+Authors: Gregory R. Warnes, Ben Bolker, Gregor Gorjanc, Gabor
+  Grothendieck, Ales Korosec, Thomas Lumley, Don MacQueen, Arni
+  Magnusson, Jim Rogers, and others