Add readme and scripting reference

.gitignore

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+# Build
+*.exe
+
 # IDEs
 .idea/

README.md

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+# keyScripter
+
+A tool to script keyboard and mouse inputs for Windows.
+
+## Scripting Reference
+
+See [SCRIPTING.md](SCRIPTING.md).
+
+## Developing
+
+### Prerequisites
+
+- Make sure you have [Go](https://golang.org/dl/) installed
+- Clone the repository
+
+### Building
+
+```shell
+go build ./cmd/keyScripter
+```
+
+This will create `keyScripter.exe`.
+
+### Formatting
+
+```shell
+go fmt ./...
+```
+
+### Dependencies
+
+Dependencies are managed using [modules](https://github.com/golang/go/wiki/Modules).

SCRIPTING.md

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+# Scripting Reference
+
+## Quick Start
+
+```
+# Lines starting with a "#" are comments.
+print "Call functions like this."
+wait 500
+print "Done!"
+```
+
+## Functions
+
+### print
+
+Print a value to the output. The first argument of `print` must be a string, which is interpreted as a [Go format](https://golang.org/pkg/fmt/) string. The rest of the arguments can be any value, and are used as values for the format. To use a value in the format string, use `%v`.
+
+Example:
+
+```
+print "A simple print."
+print "%v is replaced by the passed %v." 42 "values" 
+```
+
+Output:
+
+```
+A simple print.
+42 is replaced by the passed values.
+```
+
+### wait
+
+Wait a number of milliseconds before resuming the script.
+
+Example:
+
+```
+# Wait 1 second:
+wait 1000
+```