Added readme (#207)

* added README

* fixed README

* changes based on review comments

* edited README.md, adding code managers

* updated README with UPP project name

* added required third-party libraries

* added w3nco

README.md

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+
+# Unified Post-Processing (UPP)
+
+The Unified Post Processing (UPP) package provides tools for post
+processing for NCEP models. For historical reasons, the UPP repository
+is called EMC_post.
+
+This is part of the [NCEPLIBS](https://github.com/NOAA-EMC/NCEPLIBS)
+project. It also serves as a standalone package that is distributed to
+the community. It is built outside of nceplibs for some UFS
+applications (e.g. SRW v1.0.0).
+
+## Authors
+
+NCEP/EMC Developers
+
+Code Manager: Wen Meng, Huiya Chuang, Kate Fossell
+
+## Prerequisites
+
+This package requires the following NCEPLIBS packages:
+
+- [NCEPLIBS-g2](https://github.com/NOAA-EMC/NCEPLIBS-g2)
+- [NCEPLIBS-g2tmpl](https://github.com/NOAA-EMC/NCEPLIBS-g2tmpl)
+- [NCEPLIBS-sp](https://github.com/NOAA-EMC/NCEPLIBS-sp)
+- [NCEPLIBS-ip](https://github.com/NOAA-EMC/NCEPLIBS-ip)
+- [NCEPLIBS-bacio](https://github.com/NOAA-EMC/NCEPLIBS-bacio)
+- [NCEPLIBS-w3emc](https://github.com/NOAA-EMC/NCEPLIBS-w3emc)
+- [NCEPLIBS-w3nco](https://github.com/NOAA-EMC/NCEPLIBS-w3nco)
+- [CRTM](https://github.com/noaa-emc/emc_crtm)
+
+Also required to build NCEPpost executable (cmake option
+BUILD_POSTEXEC):
+
+- [NCEPLIBS-sigio](https://github.com/NOAA-EMC/NCEPLIBS-sigio) -
+- [NCEPLIBS-sfcio](https://github.com/NOAA-EMC/NCEPLIBS-sfcio) -
+- [NCEPLIBS-nemsio](https://github.com/NOAA-EMC/NCEPLIBS-nemsio) -
+- [NCEPLIBS-gfsio](https://github.com/NOAA-EMC/NCEPLIBS-gfsio)
+
+The [NCEPLIBS-wrf_io](https://github.com/NOAA-EMC/NCEPLIBS-wrf_io)
+library is required to build with NCEPpost with WRF-IO library (cmake
+option BUILD_WITH_WRFIO).
+
+The following third-party libraries are required:
+
+- [netcdf-c](https://github.com/Unidata/netcdf-c)
+- [netcdf-fortran](https://github.com/Unidata/netcdf-fortran)
+- [Jasper](https://github.com/jasper-software/jasper)
+- [libpng](http://www.libpng.org/pub/png/libpng.html)
+- [libz](https://zlib.net/)
+
+## Building
+
+Builds include:
+
+- Operational use GNC build as Wen described for both library and
+  executable (library used for GFS only at this time)
+
+- MRW App uses UPP packaged with nceplibs and cmake to build/run with
+  executable (via release/public-v1 branch).
+
+- SRW App uses UPP repo branch/tag directly and uses cmake to
+  build/run with executable (via release/public-v2 branch).
+
+- Community standalone uses UPP repo branch/tag directly and uses
+  cmake to build/run with executable (via release/public-v2
+  branch). For these procedures, we add a
+  -DCMAKE_PREFIX_PATH=${INSTALL_PREFIX} where INSTALL_PREFIX is the
+  location of the nceplibs installation as a dependency requirement.
+
+```
+mkdir build
+cd build
+cmake .. -DCMAKE_INSTALL_PREFIX=/path/to/install 
+make 
+make test
+make install
+```
+
+## Disclaimer
+
+The United States Department of Commerce (DOC) GitHub project code is
+provided on an "as is" basis and the user assumes responsibility for
+its use. DOC has relinquished control of the information and no longer
+has responsibility to protect the integrity, confidentiality, or
+availability of the information. Any claims against the Department of
+Commerce stemming from the use of its GitHub project will be governed
+by all applicable Federal law. Any reference to specific commercial
+products, processes, or services by service mark, trademark,
+manufacturer, or otherwise, does not constitute or imply their
+endorsement, recommendation or favoring by the Department of
+Commerce. The Department of Commerce seal and logo, or the seal and
+logo of a DOC bureau, shall not be used in any manner to imply
+endorsement of any commercial product or activity by DOC or the United
+States Government.