basic doc + @autodoc functions

docs/src/api.md

@@ -0,0 +1,17 @@
+# API documentation
+
+## Index
+
+```@index
+```
+
+```@meta
+DocTestSetup = quote
+    using JuliaFEM
+end
+```
+
+```@autodocs
+Modules = [JuliaFEM]
+```
+

docs/src/index.md

@@ -1,27 +1,35 @@
 # JuliaFEM.jl documentation
 
 ```@contents
+Pages = ["index.md", "api.md"]
 ```
 
-```@meta
-DocTestSetup = quote
-    using JuliaFEM
-    using JuliaFEM.Preprocess
-end
+The JuliaFEM project develops open-source software for reliable, scalable,
+distributed Finite Element Method.
+
+The JuliaFEM software library is a framework that allows for the distributed
+processing of large Finite Element Models across clusters of computers using
+simple programming models. It is designed to scale up from single servers to
+thousands of machines, each offering local computation and storage. The basic
+design principle is: everything is nonlinear. All physics models are nonlinear
+from which the linearization are made as a special cases. 
+
+## Installing and testing package
+
+Installing package goes same way like other packages in julia, i.e.
+```julia
+julia> Pkg.add("JuliaFEM")
 ```
 
-## Constants
-
-Add here.
-
-## Functions
-
-```@docs
-JuliaFEM.Preprocess.create_surface_elements
+Testing package can be done using `Pkg.test`, i.e.
+```julia
+julia> Pkg.test("JuliaFEM")
 ```
 
-## Index
-
-```@index
-```
+## Contributing
 
+Have a new great idea and want to share it with the open source community?
+From [here](https://github.com/JuliaLang/julia/blob/master/CONTRIBUTING.md)
+and [here](https://juliadocs.github.io/Documenter.jl/stable/man/contributing/)
+you can look for coding style. [Here](https://docs.julialang.org/en/stable/manual/packages/#Making-changes-to-an-existing-package-1) is explained how to contribute to
+open source project, in general.