Cleaned up links to CONTRIBUTE.md (#332)

* Added *.orig to git ignore for bad merge files

* Renamed contributing to .md file

* Updated PR template to link to contrib doc

* Added link to contrib in README

.github/pull_request_template.md

@@ -8,7 +8,7 @@ We apologize, as we would love to dedicate the time it deserves to every PR, but
 -->
 
 # Checklist
-- [ ] I have read CONTRIBUTING.txt
+- [ ] I have read [CONTRIBUTING.md](./CONTRIBUTING.md)
 - [ ] I have described what this PR contains
 - [ ] This PR addresses one or more open issues that were assigned to me:
       - *list issue(s) here*

.gitignore

@@ -1,5 +1,6 @@
 # Created by https://www.toptal.com/developers/gitignore/api/xcode,swift,macos
 # Edit at https://www.toptal.com/developers/gitignore?templates=xcode,swift,macos
+*.orig
 
 ### macOS ###
 # General

README.md

@@ -5,6 +5,9 @@ The Lemmy client for iOS.
 
 [![Mastodon Link](https://img.shields.io/mastodon/follow/108939255808776594?domain=https%3A%2F%2Fmstdn.social&label=Follow%20me%20for%20updates&style=flat)](https://elk.zone/mstdn.social/@davidbures)
 
+## Want to contribute?
+Read our [contribution guide](./CONTRIBUTING.md) to get started!
+
 ## What is Mlem?
 Mlem is a client for [Lemmy](https://join-lemmy.org), a Reddit-esque, open-source link aggregator. With Mlem, you can effortlessly participate in the conversation across all Lemmy servers.