Add files via upload

I have added Econometrics course

Author: hahustat

Econometrics.swc

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+---
+title: "Econometrics"
+---
+
+### Author
+
+- Tedros Gebregegrgs
+
+### Co-Authors
+
+### Description
+
+Econometrics using R.
+
+### Installation
+
+```r
+swirl::install_course("Econometrics")
+```
+
+#### Manual Installation
+
+1. Download [this](http://swirlstats.com/scn/Econometrics.swc) file.
+2. Run `swirl::install_course()` in the R console.
+3. Select the file you just downloaded.
+
+### Website
+
+- https://github.com/swirldev/swirl_courses