Add a (temporary?) README to describe what is being done.

git-svn-id: https://svn.dealii.org/branches/branch_petscscalar_complex@31335 0785d39b-7218-0410-832d-ea1e28bc413d

diff --git a/tests/petsc_scalar_complex/README b/tests/petsc_scalar_complex/README
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+Some (if not most) of these tests were ported from the petsc
+directory. They fall into three categories:
+
+(*) Ported - Reason: Check a similar real-number functionality with
+complex numbers. In this case various modifications are made to
+facilitate two-dimensional numbers; eg sd::complex<double> and
+PetscScalar.
+
+(*) Cloned - Reason: Check the correct (expected) behaviour is
+obtained for petsc-scalar=complex is obtained as was for
+petsc-scalar=real. In this case the .cc file is (almost) identical to
+the original and the expected output (cmp/generic) is copied from the
+original without modification.
+
+(*) New - Reason: Obvious.
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