Added docs and project management tool update

doc/cw/getsliderestitutiondirlin.txt

@@ -0,0 +1,8 @@
+#title getSlideRestitutionDirLin [RCBasic Doc]
+#header function  getSlideRestitutionDirLin( constraint_id)
+
+Returns the restitution value for linear motion. This value determines how much energy is conserved in a collision or interaction involving linear movements of the connected actors.
+
+When the actors collide or interact, the restitution value dictates how much of their energy is retained after the interaction.
+
+#ref SetSlideRestitutionDirLin