First implementation of CLI tool

cli/xgotext/README.md

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+# xgotext
+
+CLI tool to extract translation strings from Go packages into .PO files. 
+
+## Installation
+
+```
+go install github.com/leonelquinteros/gotext/cli/xgotext
+```
+
+## Usage
+
+```
+xgotext /path/to/go/package [/path/to/output/dir]
+```
+
+## Implementation
+
+This is the first (naive) implementation for this tool. 
+
+It will scan the Go package provided for method calls that matches the method names from the gotext package and write the corresponding translation files to the output directory. 
+
+Isn't able to parse calls to translation functions using parameters inside variables, if the translation string is inside a variable and that variable is used to invoke the translation function, this tool won't be able to parse that string. See this example code: 
+
+```go
+// This line will be added to the .po file
+gotext.Get("Translate this")
+
+tr := "Translate this string"
+// The following line will NOT be added to the .po file
+gotext.Get(tr)
+```
+
+The CLI tool doesn't traverse sub-directories and other packages.
+
+
+## Contribute
+
+Please
+