Create initial README.md

Change contains:
* Addition of initial tags and metadata fields
* Addition of skeleton for description
* Full readme content to be provided later

Type: Project Setup

README.md

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+---
+annotations_creators: []
+license: other
+language_creators:
+- crowdsourced
+language:
+- code
+task_categories:
+- text-generation
+tags:
+- code
+size_categories:
+- unknown
+source_datasets: []
+pretty_name: iva-swift-raw
+task_ids:
+- language-modeling
+---
+
+# GitHub Swift Code Dataset
+
+## Dataset Description
+Soon...
+
+### How to use it
+Soon...
+
+## Data Structure
+Soon... 
+
+### Data Fields
+
+|Field|Type|Description|
+|---|---|---|
+|repo_name|string|name of the GitHub repository|
+|path|string|path of file in GitHub repository|
+|copies|string|number of occurrences in dataset|
+|code|string|content of source file|
+|size|int|size of source file in bytes|
+|license|string|license of GitHub repository|
+
+## Languages
+
+The dataset contains 30 programming languages with over 60 extensions:
+
+```python
+{
+    "Swift": [".swift"]
+}
+```
+
+## Licenses
+Soon...
+
+## Dataset Statistics
+Soon... 
+
+## Dataset Creation
+
+The dataset was created in the following steps:
+1. Files of with the extensions given in the list above were retrieved from the GitHub dataset on BigQuery. TODO: Link to query and date.
+2. TODO: Add curating steps
+
+## Considerations for Using the Data
+
+The dataset consists of source code from a wide range of repositories. As such they can potentially include harmful or biased code as well as sensitive information like passwords or usernames.