Added package description

Convex_hull_3/doc_tex/Convex_hull_3/PkgDescription.tex

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+\begin{ccPkgDescription}{3D Convex Hulls\label{Pkg:ConvexHull3}}
+\ccPkgSummary{This package provides functions 
+for computing convex hulls in three dimensions as well as functions
+for checking if sets of points are strongly convex are not. One can
+compute the convex hull of a set of points in three dimensions in one
+of three ways in \cgal: using a static algorithm, using an incremental
+construction algorithm, or using a triangulation to get a fully
+dynamic computation.}
+
+\ccPkgDependsOn{All algorithms produce as output a \ccRef[3D Polyhedron]{Pkg:POlyhedron}. 
+                The dynamic algorithms depend on \ccRef[3D Triangulations]{Pkg:Triangulation3}}
+\ccPkgMaturity{Introduced in \cgal\ 1.0}
+\ccPkgLicense{\ccLicenseQPL}
+\end{ccPkgDescription}