add instructions for quick install

Author: Jonathanlyj

README.md

@@ -15,6 +15,12 @@ scalable I/O performance.
 * MPI C library and Python package, [mpi4py](https://mpi4py.readthedocs.io/en/stable/install.html).
 * [PnetCDF C library](https://github.com/Parallel-netCDF/PnetCDF), built with shared libraries.
 
+### Quick Installation
+* Make sure have a working MPI and pnetcdf-C software and then use pip to install pnetcdf-Python library from PyPI
+  ```
+  CC=/path/to/mpicc PNETCDF_DIR=/path/to/pnetcdf/dir/ pip install pnetcdf
+  ```
+
 ### Developer Installation
 * Clone this GitHub repository
 * Required software for developer installation:

docs/source/installation/install.rst

@@ -6,8 +6,12 @@ Installation
 Quick Install
 ===================================
 
-Quick installation via pip install is currently unavailable as this library has not yet been uploaded to PyPI. 
-Please follow building from source instructions provided below to set up the library.
+Software Requirements
+ - PnetCDF C library (built with shared libraries) and MPI C library
+
+Make sure have a working MPI and pnetcdf-C software and then use pip to install pnetcdf-Python library from PyPI
+.. code-block:: bash
+    $ CC=/path/to/mpicc PNETCDF_DIR=/path/to/pnetcdf/dir/ pip install pnetcdf
 
 Install from Source
 ============================================