Create Install.md

doc/Install.md

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+# Install BG_Flood
+
+## Windows 10 - 11
+
+On windows OS you should be able to use the binaries/executable we make available in each release.
+simply download and unzip the file in a suitable directory and either add the folder to your PATH or move the dll and .exe around where you what to run. 
+
+### Build from source
+To build BG_Flood from source on Windows you will need to have pre install:
+* Visual Studio Community with C++ component installed
+* Compatible Cuda toolkit
+* Downloaded/cloned/forked source of the repo
+* Netcdf developer install (i.e. netcdf.h and netcdf.lib)
+
+#### Setup Visual Studio
+1. start a new empty project
+1. add CUDA build dependencies to the project
+1. add NetCDF folder(s) to the include and library directories in the project properties
+1. add "netcdf.lib" to the input (Properties -> Linker -> Input)
+1. switch the "Generate Relocatable device code" to Yes (Properties -> CUDA C/C++ -> Common)
+1. disable deprecation add _CRT_SECURE_NO_WARNINGS to preprocessor definition (Properties -> C/C++ -> Preprocessor)
+
+## Linux OS