added detailed index

Author: matbesancon

docs/src/index.md

@@ -1,3 +1,5 @@
+ # LightGraphsMatching.jl: matching algorithms for LightGraphs
+
 ```@meta
 CurrentModule = LightGraphsMatching
 DocTestSetup = quote
@@ -12,3 +14,12 @@ Modules = [LightGraphsMatching]
 Pages = ["LightGraphsMatching.jl", "maximum_weight_matching.jl", "lp.jl", "blossomv.jl"]
 Order = [:function, :type]
 ```
+
+This is the documentation page for `LightGraphsMatching`. 
+In all documentation examples, we assume LightGraphsMatching has been imported into scope
+and that LightGraphs is available with the alias `lg`:
+```julia
+using LightGraphsMatching
+import LightGraphs
+const lg = LightGraphs
+```