Initial commit.

Makefile

+all:	hello

README.md

+# Third git exercise (c flavor)
+
+In this series of exercises, we assume you are working as a team of
+two: one of you is acting as a developer, the other as the project
+maintainer.
+
+To validate this exercise, you have to perform the following actions:
+
+ - [Maintainer] fork the project
+ - [Maintainer] enforce that only maintainers can merge into the main branch
+ - [Maintainer] enforce that no one can directly push into the main branch
+ - [Maintainer] invite your teammate as a developer on the project
+ - [Maintainer] also invite your teacher as a developer
+ - [Developer] Clone the repository
+ - [Developer] Identify the problem with this project and write an issue about it
+ - [Developer] Create a dedicated branch to fix the problem
+ - [Developer] Once you are happy with your work, propose a Merge Request
+ - [Maintainer] Review the proposal, and comment if need be
+ - [Developer] Improve your review following the maintainer's commnets
+ - [Maintainer] When the Merge Request seems acceptable, accept it into the main branch
+
+If you have already validated this exercise and a similar one, both as
+developer and as maintainer, here are some follow-up questions, to do
+with your teammate:
+
+ - [Maintainer] Add a .gitlab-ci.yml file at the root of the project, with the following
+   content, with IMAGE being gcc for a C program or python:3.10 for python scripts (and
+   push it into the main branch)
+
+```
+    test:
+            image: IMAGE
+            script:
+                    - make check
+```
+
+ - [Maintainer] Configure the repository so that a Merge Request can
+   only be accepted if the CI pipeline (the `make check` above) succeeds.
+ - [Maintainer] Look at the CI/CD 
+ - [Developer] Write a Makefile and some tests in a dedicated branch
+ - [Developer] Once you are satisfied, fill a Merge Request
+ - [Maintainer] Try and validate the Merge Request. If it does not work, discuss with your dev.
+

hello.c

+#include <stdio.h>
+
+void main(int argc, char* argv[]) {
+	if (argc < 2)
+		printf("Hello world!\n");
+	else if (argc == 2)
+		printf("Hello %s!\n", argv[1]);
+	else {
+		printf("Hello ");
+		printf(argv[1]);
+		for (int i=2; i < argc; i++)
+			printf(", %s", argv[i]);
+		printf("!\n");
+	}
+}