Added a basic README.

README.md

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+# finley
+Package finley provides functionality that extends the CLI implementation of
+ILSpy (https://github.com/icsharpcode/ILSpy). ILSply is an open source .NET
+decompiler. It is normally invoked as a GUI application. However, a CLI
+implementation ('ilspycmd') provides a better platform for automation.
+
+The primary features of finley include recursive decompilation of .NET
+binaries  in a given directory, duplicate .NET binary avoidance, and
+configurable concurrent decompilation of .NET binaries.
+
+## Requirements
+Before using finley, you must install `ilspycmd`. This requires the .NET Core
+SDK. If you are a chocolatey user, you can install this by running:
+```
+choco install dotnetcore-sdk -y
+```
+
+After installing .NET Core SDK, you can install `ilspycmd` by executing the
+following command:
+```
+dotnet tool install -g ilspycmd --version 6.0.0.5559-preview2
+```
+
+Note: the version number of `ilspycmd` is explicitly provided. This is because,
+at the time of writing this post, the current non-preview version of `ilspycmd`
+does not support the shipping version of .NET Core.
+
+## Usage
+Typically, finley is used to decompile a directory containing .NET binaries:
+```
+finley -d some-directory
+```
+
+If you would like to recursively decompile all of the binaries in a given
+directory (i.e., include sub-directories), you can add the `-r` argument:
+```
+finley -d some-directory -r
+```
+
+For additional arguments, run with the `-h` option. This will produce a list of
+arguments and an explanation of their effects:
+```
+  -allow-duplicates
+    	Decompile file even if its hash has already been encountered
+  -d string
+    	The directory to search for DLLs
+  -e string
+    	Comma separated list of file extensions to search for (default ".dll")
+  -no-ilspy-errors
+    	Exit if ILSpy fails to decompile a file
+  -num-workers int
+    	Number of .NET decompiler instances to run concurrently (default 8)
+  -o string
+    	The output directory. Creates a new directory if not specified
+  -r	Scan recursively
+  -respect-file-case
+    	Respect filenames' case when matching their extensions
+```