Update README.md

Add Usage

1 files changed, 41 insertions, 2 deletions

diff --git a/README.md b/README.md
index a339f2a..34523b6 100644
--- a/README.md
+++ b/README.md
@@ -10,6 +10,45 @@ It's in the MVP stage, with the ability to view summary, trees, blobs, and commi
 
 ## Usage
 
-TODO
+Dependencies:
 
-You need to edit the shebang of `cgi.py`.
+- relatively new version of Python (3.8.3 personally)
+- pygit2 (`pip install pygit2`)
+- a gemini server capable of serving CGI
+
+You need to edit the shebang of `git-gmi/cgi`:
+
+```python
+# change this:
+#!/home/fakefred/p/git.gmi/venv/bin/python3.8
+# to the path to your python executable as a shebang
+import gateway
+```
+
+also stuff in `const.py`:
+
+```python
+GIT_CATALOG = "/home/fakefred/p/gemini/repos/" # dir where your repos are placed
+CGI_PATH = "/git/cgi/" # path after the host part of URL that invokes the CGI script
+# for example, gemini://fkfd.me/git/cgi/ is the entrance URL, hence /git/cgi/
+GIT_GMI_SITE_TITLE = "git.gmi demo instance" # whatever you want
+# ...
+```
+
+Let's suppose you put your Gemini static files in `/path/to/gemini/`. Clone git.gmi to `/path/to/git.gmi/`. Then, symlink the `git-gmi` subdir to `/path/to/gemini/git/`.
+
+```
+$ cd /path/to
+$ git clone https://git.sr.ht/~fkfd/git.gmi
+$ ln -s /path/to/git.gmi/git-gmi gemini/git`
+$ ls gemini/git # this is your cgi-bin dir
+cgi  const.py  gateway.py  git.py
+```
+
+Then, if you use Jetforce, run:
+
+```
+$ jetforce --dir /path/to/gemini --cgi-dir git [other arguments]
+```
+
+Access your instance at `gemini://your-domain-or-ip/git/cgi/`. Don't forget the trailing slash.
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