added readme

Author: florestankorp

README.md

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+# filter-go
+
+This is my first attempt at writing [Go](https://go.dev/).
+
+When I set out to learn this language, I wanted to build something simple, fun and challenging:
+
+This [this problem set](https://cs50.harvard.edu/x/2022/psets/4/filter/more/) felt like a worthwhile challenge because it had just the right amount of complexity paired with the playfulness of manipulating bytes, sometimes leading to unexpected and interesting glitches:
+
+**Calculation errors when reversing the image**
+
+![glitch-02](/assets/glitches/glitch-02.bmp)
+
+**Calculation errors when computing averages**
+
+![glitch-01](/assets/glitches/glitch-01.bmp)
+
+# About 
+This is a command line application that allows the user to input a BMP image and apply a transformation to it. The program then outputs the result.
+
+The app can perform the following transformations:
+*  Convert the image to grayscale
+*  Reflect the image horizontally
+*  Blur the image
+
+# Requirements
+You need Go to run this app. You can find instructions on how to install it [here](https://go.dev/doc/install)
+
+# Usage
+From the root of the project you can run 
+
+`$ go build && ./filter-go [flag] <infile>.bmp <outfile>.bmp`
+
+To try out the app use the sample BMP files stored in the `/assets` folder. Resulting files will be written to the `/out` folder.
+
+## Flags
+
+```sh
+  -b    Blur image
+  -g    Make image grayscale
+  -r    Reflect image horizontally
+```
+
+# Thanks
+
+All the [Discord Gophers](https://discord.com/channels/118456055842734083/118456055842734083) that took the time to answer my questions <3