Add docs, correct URL

docs/infrastructure/processor.md

@@ -0,0 +1,19 @@
+---
+title: Processor
+layout: default
+nav_order: 2
+parent: Infrastructure
+---
+
+The processor performs several important tasks with regards to the external
+network. Each of them are documented in the following sections.
+
+# Key Generation
+
+# Scanning
+
+# Signing Batches
+
+# Planning Transactions
+
+# Cosigning