Added README.md and shellnotes.sh

README.md

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+# shellnotes
+A simple and easy way to keep notes via your linux terminal.
+
+# How to download
+
+-You can either download or clone this repository.
+
+# How to install
+## step 1:
+
+-Place the file "shellnotes.sh" into your home folder.
+
+## step 2:
+
+-Rename the file and add a dot before its name. It should look like this: ".shellnotes.sh" in the home folder.
+
+## step 3:
+
+-Open the terminal and type:
+`chmod +x ~/.shellnotes.sh`
+
+## step 4:
+
+-Open any text editor you want. Select "Open file" from its menu (Usually top left) and navigate to your home folder. Then, press `Ctrl + H` in order to show all the hidden files and folders
+in the home directory. Find a file called `.bashrc` and open it.
+
+## step 5:
+
+-Go to the last line of the file you opened at step 4, and write: `source ~/.shellnotes.sh` in order to be able to use shellnotes every time you launch your terminal.
+
+# Warnings!
+*THIS FILE IS ONLY FOR LINUX USERS* (prefered distro: Ubuntu 17.10 or higher)
+
+*DON'T CHANGE THE SCRIPT* (Only in case you don't have the default editors who are gedit and nano. In that case, you can either change them, or install the default ones.)
+
+*DON'T USE newnote() TO READ NOTES* (Same goes for readnote() for writing new ones.)
+
+*DON'T JUDGE ME* (This is my first shell script.)
+*HAVE FUN WITH SHELLNOTES!!!*