Start to make examples

[GopherJ]

It'll help the developpers a lot if we can add more examples like what actix-web has done: https://github.com/actix/examples

Currently we don't have enough docs. I hope me or anyone else can find time to add them.

But at the same time we can already start to prepare some examples like:

1. actix-web + casbin example with fileadapter
2. actix-web + casbin example with diesel-adapter
3. actix-web + casbin example using CachedEnforcer (default cache)
   ...

Maybe we can also add some examples on other web frameworks.

I added an repo if anyone wants to contribute.

https://github.com/casbin-rs/examples

[omid]

I've already started the second option. It's not finished, since I faced some problems in the diesel-adapter. After releasing version 0.3.0 it's more possible to be able to finalize it.

[GopherJ]

@omid don't hesitate if you have met any problems.

[omid]

@GopherJ PR is created @ casbin-rs/examples#2

[hackerchai]

actix-web + casbin example with diesel-adapter, using CachedEnforcer
https://github.com/casbin-rs/examples/tree/master/actix-middleware-example