DOC: Document the release process in a Markdown file.
DOC: Document the release process in a Markdown file.

Add a markdown file to documentation to describe the release process.

Change-Id: Ied258e75717352128510042fc0604e19b6a0ecd0

malaterre/ITK,InsightSoftwareConsortium/ITK,malaterre/ITK,vfonov/ITK,stnava/ITK,spinicist/ITK,InsightSoftwareConsortium/ITK,blowekamp/ITK,spinicist/ITK,thewtex/ITK,thewtex/ITK,fbudin69500/ITK,fbudin69500/ITK,LucasGandel/ITK,hjmjohnson/ITK,thewtex/ITK,vfonov/ITK,richardbeare/ITK,LucasGandel/ITK,hjmjohnson/ITK,Kitware/ITK,fbudin69500/ITK,fbudin69500/ITK,BRAINSia/ITK,thewtex/ITK,stnava/ITK,hjmjohnson/ITK,InsightSoftwareConsortium/ITK,vfonov/ITK,thewtex/ITK,BRAINSia/ITK,BRAINSia/ITK,blowekamp/ITK,LucasGandel/ITK,malaterre/ITK,Kitware/ITK,richardbeare/ITK,spinicist/ITK,stnava/ITK,stnava/ITK,spinicist/ITK,stnava/ITK,hjmjohnson/ITK,richardbeare/ITK,thewtex/ITK,vfonov/ITK,blowekamp/ITK,richardbeare/ITK,hjmjohnson/ITK,blowekamp/ITK,malaterre/ITK,stnava/ITK,InsightSoftwareConsortium/ITK,spinicist/ITK,vfonov/ITK,malaterre/ITK,BRAINSia/ITK,vfonov/ITK,Kitware/ITK,blowekamp/ITK,Kitware/ITK,spinicist/ITK,fbudin69500/ITK,thewtex/ITK,InsightSoftwareConsortium/ITK,malaterre/ITK,blowekamp/ITK,BRAINSia/ITK,fbudin69500/ITK,fbudin69500/ITK,richardbeare/ITK,hjmjohnson/ITK,stnava/ITK,fbudin69500/ITK,vfonov/ITK,stnava/ITK,BRAINSia/ITK,Kitware/ITK,richardbeare/ITK,vfonov/ITK,Kitware/ITK,LucasGandel/ITK,LucasGandel/ITK,spinicist/ITK,stnava/ITK,spinicist/ITK,vfonov/ITK,malaterre/ITK,InsightSoftwareConsortium/ITK,Kitware/ITK,LucasGandel/ITK,malaterre/ITK,LucasGandel/ITK,richardbeare/ITK,LucasGandel/ITK,malaterre/ITK,BRAINSia/ITK,blowekamp/ITK,InsightSoftwareConsortium/ITK,blowekamp/ITK,spinicist/ITK,hjmjohnson/ITK