draft doc page for bond_style special

doc/src/bond_special.rst

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+.. index:: bond_style special
+
+bond_style special command
+=================================
+
+Syntax
+""""""
+
+
+.. code-block:: LAMMPS
+
+   bond_style special
+
+Examples
+""""""""
+
+
+.. code-block:: LAMMPS
+
+   bond_style special
+   bond_coeff 0.5 0.5
+
+Description
+"""""""""""
+
+The *special* bond style can be used to impose weighted Lennard Jones and/or
+Coloumbic interactions on any two particles in the system. It can be used for
+cases that cannot be handled in :doc:`special_bonds <special_bonds>`, such as
+1-5 interactions or hyrbrid simulations that require the use of different
+weighting factors for different molecules.
+
+The following coefficients must be defined for each bond type via the
+:doc:`bond_coeff <bond_coeff>` command as in the example above, or in
+the data file or restart files read by the :doc:`read_data <read_data>`
+or :doc:`read_restart <read_restart>` commands:
+
+* `w_lj` weight (0.0 to 1.0) on pairwise Lennard-Jones interactions
+
+* `w_coul` weight (0.0 to 1.0) on pairwise Coulombic interactions
+
+This command will typically be used in conjunction with 
+
+----------
+
+
+
+Restrictions
+""""""""""""
+
+This bond style can only be used if LAMMPS was built with the
+USER-MISC package.  See the :doc:`Build package <Build_package>` doc
+page for more info.
+
+Related commands
+""""""""""""""""
+
+:doc:`bond_coeff <bond_coeff>`, :doc:`special_bonds <special_bonds>`,
+
+**Default:** none