Add installation instructions

README.md

@@ -1,3 +1,31 @@
 # gtranslate
 Better front-end for Google Translate that doesn't track you and works
 without JavaScript.
+
+# Installation
+```sh
+git clone https://git.sr.ht/~yerinalexey/gtranslate
+cd gtranslate
+
+go build
+```
+
+Then run the server with
+
+```sh
+./gtranslate
+```
+
+If you want to use a different port:
+
+```sh
+./gtranslate -b :3000 # will run on port 3000
+```
+
+Note: if you're running it outside of development environment, you
+should pass `--template-dir` and `--static-dir` arguments pointing to
+templates and static directories:
+
+```sh
+./gtranslate --template-dir /usr/share/webapps/gtranslate/templates --static-dir /usr/share/webapps/gtranslate/static
+```