Updated README (#15)

* added install guide
* fixed typos

README.md

@@ -1,13 +1,29 @@
 # Railway Result
 
-Implementation of a **Result Pattern** for C# with functional extension methods leveraging **Railway Oriented Programming**. Learn more about [Railway Oriented Programming](https://fsharpforfunandprofit.com/rop/).
+Implementation of a **Result Pattern** for C# with functional extension methods leveraging **Railway Oriented Programming** (ROP). Learn more about [Railway Oriented Programming](https://fsharpforfunandprofit.com/rop/).
 
-Extension Methods:
+### Install
 
-- `Ensure` and `EnsureNotNull` - tests for condition resulting in succedded/failed result object (railway).
-- `Then` - maps current value of result object to a new value (on succeeded railway).
-- `Tap` - invokes funcion on value of result object (on succeeded railway).
-- `And` - encapsulates additional value into result object (on succeeded railway).
+Install RailwayResult with NuGet:
+```powershell
+Install-Package Skrasek.RailwayResult # result object
+Install-Package Skrasek.RailwayResult.Errors # predefined error types
+Install-Package Skrasek.RailwayResult.FunctionalExtensions # extension methods for ROP
+```
+
+or via the .NET CLI:
+```powershell
+dotnet add package Skrasek.RailwayResult
+dotnet add package Skrasek.RailwayResult.Errors
+dotnet add package Skrasek.RailwayResult.FunctionalExtensions
+```
+
+#### Extension Methods:
+
+- `Ensure` and `EnsureNotNull` - tests for condition resulting in successful/failed result object (railway).
+- `Then` - maps current value of result object to a new value (on successful railway).
+- `Tap` - invokes function on value of result object (on successful railway).
+- `And` - encapsulates additional value into result object (on successful railway).
 
 ### Example:
 ```csharp
@@ -36,7 +52,7 @@ public Result<TeamMember> GetTeamMember(Guid memberId)
 }
 ```
 
-### Result Pattern without using railway-oriented programing:
+### Result Pattern without using railway-oriented programming:
 ```csharp
 public Result SetMemberRole(Guid initiatorId, Guid memberId, TeamRole newRole)
 {