Added MD5.ps1 and SHA1.ps1

Scripts/MD5.ps1

@@ -0,0 +1,12 @@
+#!/snap/bin/powershell
+#
+# Syntax:	MD5.ps1 <file>
+# Description:	prints the MD5 checksum of the given file
+# Author: 	Markus Fleschutz
+# Source:	github.com/fleschutz/PowerShell
+# License:	CC0
+# 
+param([string]$File)
+$Result = get-filehash $File -algorithm MD5
+write-host $Result.Hash
+exit 0

Scripts/SHA1.ps1

@@ -0,0 +1,12 @@
+#!/snap/bin/powershell
+#
+# Syntax:	SHA1.ps1 <file>
+# Description:	prints the SHA1 checksum of the given file
+# Author: 	Markus Fleschutz
+# Source:	github.com/fleschutz/PowerShell
+# License:	CC0
+# 
+param([string]$File)
+$Result = get-filehash $File -algorithm SHA1
+write-host $Result.Hash
+exit 0

Scripts/SHA256.ps1

@@ -1,13 +1,12 @@
 #!/snap/bin/powershell
 #
+# Syntax:	SHA256.ps1 <file>
 # Description:	prints the SHA256 checksum of the given file
 # Author: 	Markus Fleschutz
 # Source:	github.com/fleschutz/PowerShell
 # License:	CC0
 # 
-param(
+param([string]$File)
-[string]$File)
+$Result = get-filehash $File -algorithm SHA256
-
-$Result = get-filehash $File
 write-host $Result.Hash
 exit 0