Add draft abstract for fpm GSoC project

Author: LKedward

FortranCon2021-gsoc-fpm-flags/README.md

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+# FortranCon2021: Handling Compiler Flags in fpm (GSoC)
+
+__Presenter:__ [Jakub Jelinek](https://github.com/kubajj) (TBC)
+
+__Co-Authors:__ [Laurence Kedward](https://github.com/LKedward), [Brad Richardson](https://github.com/everythingfunctional)
+
+__Session:__ Fortran-lang
+
+__Abstract:__
+The Fortran Package Manager (fpm) aims to be a Fortran-specific build system to simplify compiling Fortran code and using third-party dependencies.
+Fpm is currently in alpha development status and supports a wide range of features.
+Recent work, undertaken as part of the Google Summer of Code programme, has implemented the syntax and logic required to provide fine-grain control of compiler flags by package maintainers.
+Specifying compiler flags for fpm projects is a complex problem due the existence of multiple Fortran compilers, each with their own set of flags.
+Moveover, package maintainers often need to specify different flags for a variety of build profiles, such as 'debug' and 'release', as well as across a variety of target operating systems.
+
+In this presentation, detail is given on the new functionality for specifying compiler flags in fpm including: the syntax for the manifest file; the behaviour for package dependencies; and common use-case examples.