update README

README.md

@@ -1,2 +1,31 @@
 # popgis
-Blazing fast ingestion of ShapeFile & GeoJSON into a PostGIS database
+A blazing fast way to insert Shapefiles & GeoJSON into a PostGIS database.
+
+## Install
+*Upcoming...*
+
+## Usage
+Required flags are `input`, `uri` & `table`.
+
+1. Use the **input** flag to choose the *shapefile* or *geojson* file to insert into a PostGIS database.
+2. Use the **uri** flag to tell `popgis` the PostGIS database where you'd like to insert the input data.
+3. The **table** flag is for choosing the name of the resulting table.
+
+## Examples
+*Upcoming...*
+
+## License
+See [`LICENSE`](./LICENSE)
+
+## Benchmarks
+*Upcoming...*
+
+## Limitations
+Currently, only ShapeFile files are implemented.
+
+## Future implementation
+The list below contains the upcoming implementations.
+
+To do:
+
+* Allow GeoJSON as input.

src/file_types/mod.rs

@@ -1,3 +1,4 @@
 pub mod common;
 mod geo;
 pub mod shapefile;
+pub mod geojson;