progresslog: Add package documentation.

internal/progresslog/README.md

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+progresslog
+===========
+
+[![Build Status](https://github.com/decred/dcrd/workflows/Build%20and%20Test/badge.svg)](https://github.com/decred/dcrd/actions)
+[![ISC License](https://img.shields.io/badge/license-ISC-blue.svg)](http://copyfree.org)
+[![Doc](https://img.shields.io/badge/doc-reference-blue.svg)](https://pkg.go.dev/github.com/decred/dcrd/internal/progresslog)
+
+Package progresslog provides periodic logging for block processing.
+
+Tests are included to ensure proper functionality.
+
+## Feature Overview
+
+- Maintains cumulative totals about blocks between each logging interval
+  - Total number of blocks
+  - Total number of transactions
+  - Total number of votes
+  - Total number of tickets
+  - Total number of revocations
+- Logs all cumulative data every 10 seconds
+- Immediately logs any outstanding data when the provided sync height is reached
+
+## License
+
+Package progresslog is licensed under the [copyfree](http://copyfree.org) ISC
+License.

internal/progresslog/doc.go

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+// Copyright (c) 2020 The Decred developers
+// Use of this source code is governed by an ISC
+// license that can be found in the LICENSE file.
+
+/*
+Package progresslog provides periodic logging for block processing.
+
+Tests are included to ensure proper functionality.
+
+## Feature Overview
+
+- Maintains cumulative totals about blocks between each logging interval
+  - Total number of blocks
+  - Total number of transactions
+  - Total number of votes
+  - Total number of tickets
+  - Total number of revocations
+- Logs all cumulative data every 10 seconds
+- Immediately logs any outstanding data when the provided sync height is reached
+*/
+package progresslog