Update README.md

Author: maxfleetdev

README.md

@@ -1,10 +1,53 @@
 # Command Tool for Unity 2019+
 
 ## Installation
-### Option A:
-1) Copy this repo's .git URL
-2) Open Unity Package Manager
-3) Click '+' icon and select 'Install from git URL'
-4) Paste URL
-5) Hit Enter/Click done
-6) Package will install
+### Option A (GIT Package):
+1) Open Unity Package Manager
+2) Click '+' icon and select 'Install from git URL'
+3) Paste <code>https://github.com/maxfleetdev/unity-command-tool.git</code> into prompt
+4) Hit Enter/Click done
+5) Package will begin installing
+
+### Option B (Package):
+1) Download commander.unitypackage from latest release page
+2) Double click on downloaded file
+3) Unity will automatically install inside the open project
+
+## How To Use
+### Command Attribute
+Commands are assigned by using the <code>Command[...]</code> attribute:
+```c#
+[Command("give", "Gives player an item using ID and Quantity")]
+private void GiveCommand(int id, int quantity)
+{
+  ...
+```
+Attributes have many overloads, so you can provide descriptions, hidden commands, certain role access etc (working on improving with extra attributes)
+
+Commands can be assigned in any class, static or instanced (MonoBehaviour)
+- Static Command methods are registered on startup automatically by CommandRegistry
+- Instanced Commands methods **must** be registered on creation (Awake/Start etc)
+
+### Static Command Example:
+```c#
+[Command("give", "Gives player an item using ID and Quantity")]
+private static void GiveCommand(int id, int quantity)
+{
+  AddItem(id, quantity);
+}
+```
+
+### Instance Command Example:
+```c#
+private void Awake()
+{
+  // Called Only Once
+  CommandRegistry.RegisterInstanceCommands(this);
+}
+
+[Command("give", "Gives player an item using ID and Quantity")]
+private static void GiveCommand(int id, int quantity)
+{
+  AddItem(id, quantity);
+}
+```