Move go target docs

README.md

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-
-
-# ANTLR4 Language Target, Runtime for Go
-
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-
-### Usage
-
-1. `go get github.com/pboyer/antlr4`
-2. Get [StringTemplate](http://www.stringtemplate.org/)
-3. Get [Maven](https://maven.apache.org/download.cgi)
-  - Put `mvn` in your PATH (e.g. in `~/.bashrc` add `export PATH=$PATH:/path/to/apache-maven-3.3.9/bin`)
-4. From the repo directory, `mvn install` (add `-DskipTests` to skip the tests)
-5. Put StringTemplate and ANTLR binaries on your `CLASSPATH`
-  - `export CLASSPATH=".:/path/to/ST-4.0.8.jar:$CLASSPATH"`
-  - `export CLASSPATH=".:$GOPATH/src/github.com/pboyer/antlr4/tool/target/antlr4-4.5.2-SNAPSHOT.jar:$CLASSPATH"`
-5. (Optional) Add an alias for calling antlr
-  - `alias antlr='java -jar $GOPATH/src/github.com/pboyer/antlr4/tool/target/antlr4-4.5.2-SNAPSHOT.jar'`
-6. Now, `antlr Grammar.g4 -Dlanguage=Go`
-
----
-
-_From the ANTLR README_
-
 # ANTLR v4
 
 **ANTLR** (ANother Tool for Language Recognition) is a powerful parser generator for reading, processing, executing, or translating structured text or binary files. It's widely used to build languages, tools, and frameworks. From a grammar, ANTLR generates a parser that can build parse trees and also generates a listener interface (or visitor) that makes it easy to respond to the recognition of phrases of interest.

doc/go-target.md

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+# ANTLR4 Language Target, Runtime for Go
+
+### Getting started
+
+1. Get the runtime and install it on your GOPATH: `go get github.com/antlr/antlr4`
+2. Generate the parser/lexer code: `antlr MyGrammar.g4 -Dlanguage=Go`
+
+### Referencing in your code
+
+Reference the go package like this:
+
+```go
+import "github.com/pboyer/antlr4/runtime/Go/antlr"
+```